GENERAL DESCRIPTION AND OPERATION

The Browning BT-99 is a single-barreled, break-action shotgun designed to address the specific needs of the trap shooter. The BT-99 has proven itself to be a rugged, reliable performer for both beginner and expert shooters alike. 

Highly skilled techniques of hand-fitting and polishing are used to accomplish the precise fitting of metal parts on this shotgun.  These painstaking operations are necessary to prevent looseness,  even after years of demanding use. You may consider the action of your new shotgun to be slightly stiff. This close fitting assures you of long lasting dependability. 

NOMENCLATURE

In conventional firearm terminology the position and movement of firearm parts are described as they occur with the firearm horizontal and in normal firing position: i.e., the muzzle is forward  or in front; the buttstock is rearward or to the rear; the trigger is downward or underneath; the rib is upward or on top. For general parts nomenclature, refer to Figure 1. For specific parts names related to disassembly, refer to Figure 2.

SERIAL NUMBER

The serial number of your BT-99 is found under the top lever. Record this number in the space provided at the front of this owner’s manual for future reference.

Various exposed metal parts of your new firearm have been coated at the factory with a rust preventative compound. Before assembling your shotgun, clean the anti-rust compound from the inside of the barrel, receiver and the action/chamber areas. A high-quality lightweight gun oil is ideal for removing this compound, and for giving your new firearm its first lubrication. Grease is recommended to lubricate the hinge pin, barrel lugs and forearm bracket to prevent possible galling. Clean the barrel using a cleaning rod and patch as explained under the “Cleaning and Maintenance Suggestions” section.

NOTICE: THE BROAD, POLISHED, FINELY FITTED SURFACES OF THE RECEIVER AND FOREARM MECHANISMS (BARREL LUGS, HINGE PIN AND FOREARM BRACKET) MUST ALWAYS BE COATED WITH A FILM OF HIGH QUALITY GREASE.

WARNING: THE BT-99 DOES NOT HAVE A “SAFETY” MECHANISM. UNLESS SHOOTING IS IMMINENT KEEP THE ACTION OPEN AND THE CHAMBER UNLOADED. DO NOT LOAD THE CHAMBER UNLESS SHOOTING IS IMMINENT. ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH. 

The BT-99 is designed solely for trap shooting. A trap shooter does not load his or her gun until moments before calling for a target. For this reason, and because trapshooting demands intense concentration on shooting technique, no “safety” mechanism is provided. Then, there is then no chance for a lost target by reason of the “safety” being inadvertently left in the on safe position. Remember:

• When leaving or moving along the line always open the action and unload the chamber. 
• Never have the action of your BT-99 closed except when you are on the line and ready to shoot, your gun is cased, or it is set in a gun rack at the range. 
• Never load the chamber until you are ready to shoot. Load your shotgun only when shooting is imminent. 
• Always keep the muzzle of your shotgun pointed down range when on the shooting line. 
• When you retrieve your shotgun from its case or from a gun rack, always immediately open the action and check to assure that no shell is in the chamber.

The top lever operates the locking bolt, which is hand fitted to the barrel lugs. Moving the top lever to the right unlocks the action and allows the shotgun to be loaded and unloaded. 

It is not necessary that the top lever return to a completely centered position, nor should it be hanging over the right side or edge of the receiver tang as you look down on it. Upon closing your gun, let the top lever snap into position to allow the top lever spring to return the top lever mechanism to the locked position. Do not retard its action with your thumb. Many shooters lightly push the top lever to the left after closing the breech. This operation is a quick method of assuring yourself that foreign matter has not interfered with the complete closure of the breech. 

Always keep the polished breech surfaces clean and lightly lubricated. The breech is so carefully hand fitted that accumulated debris, sand, etc. may prevent complete closing. If this should occur the action will not close. Open the gun and unload it. Carefully examine the action surfaces and remove any foreign matter. 

WARNING: ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. BEFORE STARTING ASSEMBLY PROCEDURES, VISUALLY INSPECT THE CHAMBER  TO BE ABSOLUTELY CERTAIN THE FIREARM IS COMPLETELY UNLOADED. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH.

The BT-99 is delivered in the box with the barrel removed and the forearm attached to the barrel. It is important to follow the exact sequence for assembly in order to properly assemble your shotgun. 

1. Remove the forearm from the barrel by pulling outward on the forearm latch and pivoting the front of the forearm down and away from the barrel (Figure 3). 

2. After cleaning exposed metal areas, apply a film of grease to the surfaces shown in Figure 4, Figure 5 and Figure 6.  Apply a drop of oil to the tab.

NOTICE: THE BROAD, POLISHED, FINELY FITTED SURFACES OF THE RECEIVER AND FOREARM MECHANISMS (BARREL LUGS, HINGE PIN AND  FOREARM BRACKET) MUST ALWAYS BE COATED WITH A FILM OF  HIGH QUALITY GREASE.

3. Attach the barrel to the action by grasping the buttstock’s grip with your right hand and anchoring the buttstock between your right forearm and right side. With the thumb of your right hand, move and hold the top lever sideways to the extreme right. Grasp the barrel in the left hand and engage the barrel lug’s circular hinge pin recess with the action’s hinge pin (Figure 7).

4. While keeping pressure on the barrel to keep the hinge pin aligned in the barrel lug’s circular recess, rotate the barrel upward, fully closing the action (Figure 8). Release the top lever. It should snap back into place.

5. Slide the projecting steel tab on the rear of the forearm bracket into the opposing recess in the receiver bottom (Figure 9). Pivot the forearm up to the barrel tightly. This will cause the forearm to engage onto the barrel. You should hear an audible “click” which signifies that the forearm is properly attached.

NOTICE: WHEN ASSEMBLING YOUR SHOTGUN, DO NOT USE UNDUE FORCE WHEN CLOSING THE ACTION. IF THE TOP LEVER IS NOT TO THE RIGHT OR THE ACTION AND BARREL IS NOT PROPERLY ALIGNED UNDUE FORCE WILL ONLY CAUSE THEM TO GRIND TOGETHER AND SCORE OR MAR THE FINELY FITTED SURFACES. IF THERE APPEARS TO BE INTERFERENCE, START OVER AT STEP 3, BEING CAREFUL TO PROPERLY MATE AND ALIGN THE BARREL LUG’S HINGE PIN RECESS AND THE RECEIVER HINGE PIN.

WARNING: ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. BEFORE STARTING DISASSEMBLY PROCEDURES, OPEN THE ACTION AND VISUALLY INSPECT THE CHAMBER TO BE ABSOLUTELY CERTAIN THE FIREARM IS COMPLETELY UNLOADED. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH.

1. Close the action, anchor the buttstock against your upper leg and lift outward on the forearm takedown latch. At the same time, grasp the forearm and with the help of the left hand pivot the forearm away from the barrel, removing the forearm. 
2. Open the action as explained previously. Carefully disengage the barrel lug from the hinge pin and lift the barrel upward and out of the action. 

If you are disassembling for storage, reinstall the forearm on the barrel. You will then have two compact units: The barrel and forearm and the receiver and buttstock.

WARNING: DISCHARGING FIREARMS IN POORLY VENTILATED AREAS, CLEANING FIREARMS OR HANDLING AMMUNITION MAY RESULT IN EXPOSURE TO LEAD AND OTHER SUBSTANCES KNOWN TO CAUSE BIRTH DEFECTS, REPRODUCTIVE HARM AND OTHER SERIOUS PHYSICAL INJURY. HAVE ADEQUATE VENTILATION AT ALL TIMES. WASH HANDS THOROUGHLY AFTER EXPOSURE. 

BT-99 SHOTGUNS ARE DESIGNED TO FIRE ONLY 12 GAUGE, 2¾" LOADS. USE ONLY SHELLS OF THE CORRECT GAUGE AND LENGTH. THE GAUGE AND LENGTH OF THE CHAMBER ARE INSCRIBED ON THE SIDE OF THE BARREL. DO NOT USE AMMUNITION OTHER THAN WHAT IS INSCRIBED ON THE SIDE OF THE BARREL. EXAMINE EVERY SHELL YOU PUT IN YOUR SHOTGUN. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH AND CAUSE DAMAGE TO YOUR SHOTGUN. 

USE SHELLS OF THE CORRECT LENGTH. DO NOT USE 3" OR 3½" SHELLS IN A BARREL WITH A 2¾" OR 2½" CHAMBER, OR 3½" SHELLS IN A BARREL WITH A 3" CHAMBER. DOING SO CAN RESULT IN A BUILDUP OF DANGEROUSLY HIGH PRESSURES. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH AND CAUSE DAMAGE TO YOUR SHOTGUN. 

DO NOT PUT A 16 OR 20 GAUGE SHELL IN A 12 GAUGE SHOTGUN. DO NOT PUT A 28 GAUGE SHELL IN A 20 GAUGE SHOTGUN. DO NOT PUT  

A .410 BORE SHELL IN A 28 GAUGE SHOTGUN. NEVER PUT METALLIC CARTRIDGES OF ANY KIND IN A SHOTGUN. SPECIFICALLY, NEVER PUT CENTERFIRE RIFLE OR PISTOL CARTRIDGES IN A SHOTGUN CHAMBERED FOR .410 BORE. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH AND CAUSE DAMAGE TO YOUR SHOTGUN. 

The most certain way to bulge or rupture a shotgun barrel is to load a smaller gauge shell into a larger gauge chamber. The smaller gauge shell will not fall completely through the barrel; its rim is caught by the front of a larger gauge chamber or at the larger gauge’s choke. Your shotgun will misfire (with the chamber appearing to be empty). It is then possible to load the correct gauge shell behind the smaller gauge shell. If the shotgun is then fired, the result will be a so-called “12-16, 12-20, 20-28 or 28-.410 burst” which can cause extensive damage to your shotgun and possible serious injury to you and others.

The barrel and action of this firearm have been made with safety margins over the pressures established by the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) for Service Cartridges. However, we assume no responsibility for incidents which occur through the use of cartridges of nonstandard dimension or those developing pressures in excess of SAAMI established standards.

BT-99 shotguns will shoot all factory lead and steel 12 gauge, 2¾" field and target loads.

WARNING: WHEN LOADING YOUR SHOTGUN ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION AND KEEP YOUR FINGERS AWAY FROM THE TRIGGER. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

1. Move the top lever to the right and open the breech. 
2. Check the chamber and bore to be certain they are clear of obstructions.
3. Insert a shell completely into the chamber.

WARNING: NEVER LOAD A SHELL INTO THE CHAMBER UNLESS SHOOTING IS IMMINENT. ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH. 

WARNING: THE SHOTGUN IS NOW READY TO FIRE BY SIMPLY PULLING THE TRIGGER.

BT-99 Plus models feature an ejector that ejects the empty hull from the chamber and lifts unfired shells. For proper ejection, keep the receiver level and allow the barrel to completely drop. This keeps empty hulls in full contact with the ejector.

It is important to point the breech, by canting the shotgun to the right (left for left-handed shooters), so empty hulls eject clear of your body and face. Fired hulls will be thrown completely out of the chamber upon opening the action; and unfired shells will be elevated above the chambers for unloading.

WARNING: AFTER FIRING, OR WHEN SHOOTING IS NO LONGER IMMINENT, IMMEDIATELY OPEN THE ACTION. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

WARNING: WHILE UNLOADING YOUR SHOTGUN ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION, AND YOUR FINGERS AWAY FROM THE TRIGGER. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

ALWAYS INSPECT THE CHAMBER AND BARREL CAREFULLY AFTER UNLOADING TO BE SURE ANY LIVE SHELL IS CLEARED FROM THE FIREARM.

1. Open the action by moving the top lever fully to the right. The action must be opened completely to reset the firing mechanism. 

2. Due to close manufacturing tolerances, it may be necessary to pull downward slightly on the forearm to completely open the breech. BT-99 models have an automatic extractor that lifts a shell, fired or unfired, from the chamber of the shotgun when the action is opened. The shell can then be easily removed from the chamber with your fingers. 

BT-99 Plus models feature an ejector that ejects the empty hull from the chamber and lifts unfired shells. For proper ejection, keep the receiver level and allow the barrel to completely drop. This keeps empty hulls in full contact with the ejector.

It is important to point the breech, by canting the shotgun to the right (left for left-handed shooters), so empty hulls eject clear of your body and face. Fired hulls will be thrown completely out of the chamber upon opening the action; and unfired shells will be elevated above the chambers for unloading.

IMPORTANT: Never have the action of your BT-99 closed except when you are on the line ready to shoot, when your firearm is cased, or when it is set in a gun rack at the range. Also, never load the chamber until you are ready to shoot. It is a courtesy to other shooters, and a wise safety practice, to keep the action open and unloaded at all other times.

WARNING: NEVER ATTEMPT TO REMOVE OR INSTALL A CHOKE TUBE IN A LOADED FIREARM. WHENEVER REMOVING OR INSTALLING A CHOKE TUBE IN YOUR BT-99 SHOTGUN ALWAYS KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. OPEN THE ACTION AND MAKE ABSOLUTELY CERTAIN THE SHOTGUN IS COMPLETELY UNLOADED AND KEEP YOUR FINGERS AWAY FROM THE TRIGGER. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

CAUTION: BROWNING INVECTOR-DS, INVECTOR-PLUS AND STANDARD INVECTOR CHOKE TUBES ARE NOT INTERCHANGEABLE. DO NOT USE BROWNING INVECTOR-PLUS, STANDARD INVECTOR OR INVECTOR-DS CHOKE TUBES IN ANY SHOTGUN BARREL NOT SUPPLIED BY BROWNING. DO NOT USE ANY OTHER CHOKING DEVICE IN ANY SHOTGUN BARREL SUPPLIED BY BROWNING.

USE ONLY THE APPROPRIATE GAUGE OF INVECTOR CHOKE TUBES IN  THIS SHOTGUN. DO NOT FIRE THIS SHOTGUN WITHOUT THE CORRECT CHOKE TUBES INSTALLED. DAMAGE MAY RESULT TO THE THREADS INSIDE THE BARREL.

FAILURE TO FOLLOW THIS INFORMATION COULD RESULT IN DAMAGE TO YOUR SHOTGUN OR POSSIBLE INJURY. 

NOTICE: USE ONLY THE INVECTOR CHOKE TUBE WRENCH SUPPLIED WITH YOUR SHOTGUN TO INSTALL AND REMOVE INVECTOR CHOKE TUBES. USING ANY OTHER WRENCH MAY DAMAGE THE THREADS IN THE BARREL.

CHOKE TUBE SELECTION

To help you choose the correct choke tube for each hunting and shooting situation, all Browning Invector choke tubes are inscribed on the side with the patterns they produce with both lead and steel shot. Each choke tube also has notches in the top rim of the tube (Figure 11). These notches are a code to allow you to determine the choke designation while the tube is installed. Rim notches refer specifically to lead shot. You will need to use the charts on the next page to cross-reference from lead to steel, and determine the appropriate tubes for your ammunition and hunting/shooting situation.

Most BT-99 shotguns include one choke tube. The choke tubes listed are available as accessories. Remember that Invector-DS, Invector-Plus and Standard Invector tubes are not interchangeable. Before removing or installing tubes, or reading the rim notch code, make sure your shotgun is completely unloaded.

* Not for use with steel shot. Using an over-tight choke constriction with steel shot will result in an ineffective “blown” pattern.

** Extra Full Special, extended with ports. Do not use with steel shot.

¹  When more than one choke designation is listed for a given steel shot pattern, use the more open choke listed for high velocity, larger shot size steel loads.

CHOKE TUBE REMOVAL 

1. Make sure the shotgun is completely unloaded. Always keep the muzzle pointed in a safe direction.

2. Use the choke tube wrench to loosen the tube, turning it counterclockwise. Finger-twist the tube the rest of the way out of the barrel.

CHOKE TUBE INSTALLATION

1. Make sure the shotgun is completely unloaded. Always keep the muzzle pointed in a safe direction.

2. Before installing a tube, check the internal choke tube threads in the muzzle, as well as the threads on the choke tube to be sure they are clean. Lightly oil the threads with a high-quality, lightweight gun oil.

NOTICE: FAILURE TO CLEAN AND OIL THE THREADS ON THE CHOKE TUBE COULD RESULT IN THE CHOKE TUBE SEIZING IN THE BARREL.

3. Using your fingers, screw the appropriate tube into the muzzle of the barrel, tapered end first, notched end outward. When it becomes finger-tight, use the choke tube wrench to firmly seat the tube.

NOTICE: THE CHOKE TUBE SHOULD BE PERIODICALLY CHECKED TO ASSURE THAT IT IS TIGHT AND FIRMLY SEATED. BEFORE CHECKING, FOLLOW ALL CHOKE TUBE REMOVAL AND INSTALLATION SAFETY GUIDELINES PREVIOUSLY OUTLINED.

WARNING: BEFORE PERFORMING COMB ADJUSTMENT PROCEDURES OPEN THE ACTION AND MAKE CERTAIN YOUR SHOTGUN IS COMPLETELY UNLOADED. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

The buttstock of some BT-99 shotguns features a comb that can be adjusted for both cast and drop. These adjustments allow you to achieve a perfect fit of the stock against your face, and determines how correctly and consistently your dominant eye aligns with the sight plane along the barrel rib. Different adjustable comb systems have been offered. Use this section to identify the style of comb on your shotgun and follow the instructions in that subsection to make adjustments.

ADJUSTABLE COMB TERMINOLOGY

With the gun shouldered, cast off means moving the comb to the  right of the centerline of the gun to give a fit advantage for a right-handed shooter. Cast on refers to moving the comb to the left of the centerline, giving a fit advantage for a left-handed shooter. A shotgun that is correctly adjusted for cast will have you looking directly down the center of the rib with both the front and middle beads in exact alignment. 

Adjusting the drop at the comb allows you to align your eye perfectly with the plane of the rib. The drop measurement is determined by measuring the distance between the plane formed by the top of the rib and the top of the comb itself. The higher the comb, the less drop there will be. 

A correct sight picture for trap shooters should have you looking down the rib with the bottom of the front bead resting on the top of the middle bead. This forms a “figure eight” or “stacked” configuration. Some of the rib will be showing as you sight down, but no rib will show between the beads. Lining up the beads correctly each time you shoot is what’s important.

Cast and drop adjustments are a matter of trial and error. Adjust a little at a time until you obtain the desired sight picture on the rib. Right-handed shooters may desire some cast off, with left-handed shooters preferring some cast on. The terminology is the same for right- or left-handed shooters. The net effect is to move the comb to allow the face to move farther over the stock for better eye-to-rib alignment. When properly set, the front and rear sight beads should line up perfectly each time you shoulder your shotgun.

MODELS WITH ADJUSTMENT HOLES IN THE BUTTSTOCK OR COMB

This section explains how to adjust the cast and comb height on models with holes in the right side of the buttstock or comb (Figure 12). BT-99 models with these combs may or may not be equipped with the GraCoil® Recoil Reduction System. Both feature an approximate range of 1/4" of cast on or cast off adjustment and 5/8" of drop at comb adjustment.

CAST ADJUSTMENT

1. Open the action and make sure the shotgun is completely unloaded.

2. Remove the comb by inserting a 7/64" Allen wrench into the holes found on the right side of the buttstock. (Use a 3mm Allen wrench if the holes are in the comb.) Turn the wrench counterclockwise to loosen the Allen screws. 

3. With the Allen screws loose, lift the comb from the stock. 

4. To adjust cast, loosen the two Allen screws located inside of the posts on the underside of the comb using a 7/64" Allen wrench (Figure 13). (If the posts are attached to the buttstock, use a 3mm Allen wrench to loosen the Allen screws inside the posts.) 

MODELS WITH A HOLE IN THE RECOIL PAD

This section explains how to adjust the cast and comb height on models with a single hole in the upper left side of the recoil pad (Figure 15). BT-99 models with this comb may or may not be equipped with the GraCoil® Recoil Reduction System. This comb features a total adjustment range of 1/4" of cast on and cast off adjustment and approximately 5/8" of total height adjustment. Adjustment increments are approximately 1/16". 

CAST ADJUSTMENT (WITH GRACOIL® SYSTEM)

1. Open the action and make sure the shotgun is completely unloaded.

2. Remove the buttplate by inserting a 3/32" Allen wrench into the single hole on the right side of the buttplate and turn the set screw counterclockwise two turns to loosen the screw (Figure 16).

3. Loosen the comb by inserting a 7/64" Allen wrench through the hole found on the upper left of the stock plate and into the Allen screw located within the stock plate (Figure 17). Turn the wrench counterclockwise three full turns to loosen the Allen screw, allowing adjustments to be easily made.

4. With the Allen screw loose, carefully adjust comb to desired position (Figure 14) by sliding each post equally in the desired direction. Each adjustment increment represents approximately 1/16". 

• Move the comb to the right for more cast off. 
• Move the comb to the left for more cast on.

5. If drop at comb has already been set to your desired height, tighten the Allen screw in the stock plate and reinstall the recoil pad and buttplate. The screw needs to be firmly tightened, but be careful not to overtighten. If drop has not been set, leave the Allen screw loose and proceed to “Adjusting Drop at Comb.”

ADJUSTING DROP AT COMB (WITH GRACOIL® SYSTEM)

1. Open the action and make sure the shotgun is completely unloaded.

2. Remove the buttplate by inserting a 3/32" Allen wrench into the single hole on the right side of the buttplate and turn the set screw counterclockwise two turns to loosen the screw (Figure 16). Removing the buttplate gives access to the hole found on the upper left of the stock plate. 

3. Loosen the comb by inserting a 7/64" Allen wrench through the hole found on the upper left of the stock plate and into the Allen screw located within the stock plate (Figure 17). Turn the wrench counterclockwise three full turns to loosen the Allen screw and allow adjustments to be easily made.

4. With the Allen screw loose, carefully adjust the comb to desired position (Figure 18) by raising or lowering each post equally in the desired direction. Sliding the posts equally will reduce the chance of the posts binding. Each increment represents 1/16" of movement.

• To decrease drop at comb, carefully slide the comb up.
• To increase drop at comb, carefully slide the comb down.

5. Once your desired drop at comb is obtained, tighten the Allen screw in the stock plate and reinstall the recoil pad and buttplate. The screw needs to be firmly tightened, but be careful not to overtighten.

ADJUSTING CAST ON AND CAST OFF (WITHOUT GRACOIL® SYSTEM)

The adjustable comb features a total adjustment range of 1/4" for cast on and cast off adjustment. Adjustment increments are approximately 1/16". 

1. Open the action and make sure the shotgun is completely unloaded.

2. Insert the provided 7/64" Allen wrench through the hole found on the upper left of the recoil pad and into the Allen screw located within the recoil pad (Figure 15). Once the Allen wrench is engaged with the Allen screw, turn the wrench counterclockwise three full turns to loosen the Allen screw. 

3. With the Allen screw loose, carefully adjust comb to desired position by sliding each post equally in the desired direction (Figure 14). Each adjustment increment represents approximately 1/16". 

• Move the comb to the right for more cast off. 
• Move the comb to the left for more cast on.

4. If drop at comb has already been set to your desired height, tighten the Allen screw in the recoil pad. The screw needs to be firmly tightened, but be careful not to overtighten. If drop has not been set, leave the Allen screw loose and proceed to “Adjusting Drop  at Comb.”.

ADJUSTING DROP AT COMB (WITHOUT GRACOIL® SYSTEM)

The adjustable comb features a height adjustment range of 11 increments, 1/16" per increment, resulting in approximately 5/8" of total height adjustment. 

NOTICE: DO NOT GO BEYOND THE RANGE OF ADJUSTMENT INCREMENTS. SHOULD THIS OCCUR, THE COMB WILL NOT BE PROPERLY SECURED TO THE SHOTGUN AND COULD RESULT IN INJURY OR DAMAGE TO THE FIREARM.

1. Open the action and make sure the shotgun is completely unloaded.

2. Insert the provided 7/64" Allen wrench through the hole found on the upper left of the recoil pad and into the Allen screw located within the recoil pad (Figure 15). Once the Allen wrench is engaged with the Allen screw, turn the wrench counterclockwise three full turns to loosen the Allen screw. 

3. With the Allen screw loose, carefully adjust the comb to desired position (Figure 18) by raising or lowering each post equally in the desired direction. Sliding the posts equally will reduce the chance of the posts binding. Each increment represents 1/16" of movement.

• To decrease drop at comb, carefully slide the comb up.
• To increase drop at comb, carefully slide the comb down.

4. Once your desired drop at comb is obtained, tighten the Allen screw in the recoil pad. The screw needs to be firmly tightened,  but be careful not to overtighten.

The adjustable comb features a height adjustment range of 11 increments, 1/16" per increment, resulting in approximately 5/8" of total height adjustment. 

WARNING: BEFORE PERFORMING BUTTPLATE ADJUSTMENT PROCEDURES OPEN THE ACTION AND MAKE CERTAIN YOUR SHOTGUN IS COMPLETELY UNLOADED. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

The buttplate on some BT-99 shotguns is adjustable to aid in dialing in the fit and sight picture of the shotgun (Figure 19). Adjustments to shotguns with and without the GraCoil® System are similar. To adjust the buttplate, perform the following:

1. Open the action and make sure the shotgun is completely unloaded.

2. Remove the recoil pad by inserting a 3/32" Allen wrench into the two openings in the recoil pad and removing the two screws that secure the recoil pad (Figure 20). To prevent damage to the recoil pad, place a small amount of petroleum jelly on the Allen wrench. This will prevent the Allen wrench from grabbing and possibly tearing the recoil pad.

WARNING: BEFORE PERFORMING ADJUSTMENTS, OPEN THE ACTION AND MAKE CERTAIN YOUR SHOTGUN IS COMPLETELY UNLOADED. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

Some BT-99 shotguns include a length of pull spacer that allows the stock to be shortened or lengthened to fit the shooter. To add or remove a spacer, perform the following:

1. Open the action and make sure the shotgun is completely unloaded.
2. Remove the recoil pad by inserting a 3/32" Allen wrench into the two openings in the recoil pad and removing the two screws that secure the recoil pad (Figure 20). To prevent damage to the recoil pad, place a small amount of petroleum jelly on the Allen wrench. This will prevent the Allen wrench from grabbing and possibly tearing the recoil pad.
3. Add or remove spacers between the recoil pad and buttplate or recoil pad and buttstock to adjust length of pull. 
4. Once the desired length of pull is achieved, reinstall the recoil pad by tightening the two screws with the 3/32" Allen wrench. If using two spacers, use the longer screws provided to secure the recoil pad.

WARNING: BEFORE PERFORMING ADJUSTMENTS TO THE GRACOIL® SYSTEM, OPEN THE ACTION AND MAKE CERTAIN YOUR SHOTGUN IS COMPLETELY UNLOADED. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION.  FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

Some BT-99 shotguns include the GraCoil® Recoil Reduction System (Figure 22) that features an adjustable compression unit to reduce recoil, adjust length of pull and adjust the buttplate. The GraCoil® System is highly adjustable and allows you to tailor the firearm to suit your specific requirements. 

The guide pins on the buttplate slide on Teflon™ bushings (Figure 23,). This ensures long life and smooth action of the GraCoil® System. An occasional cleaning and light lubrication of the guide pins will help prevent premature wear. A light oil is suitable for lubrication.

WARNING: PROPER ADJUSTMENT OF THE GRACOIL® SYSTEM IS ESSENTIAL. FAILURE TO PROPERLY ADJUST THE COMPRESSION COULD RESULT IN PERSONAL INJURY. IF THE TENSION IS SET TOO LIGHT, THE UNIT COULD COMPRESS ENOUGH TO PINCH THE SHOOTER, RESULTING IN INJURY.

6. Once the gun can be shouldered without compressing the GraCoil® System, it is properly set-up and will effectively absorb recoil without affecting accuracy. 

7. Reinstall the recoil pad and buttplate by sliding it back into the stock and tighten the set screws using the 3/32" Allen wrench.  Do not overtighten the screws. 

ADJUSTING LENGTH OF PULL

The GraCoil® System allows up to 1" of length of pull adjustment. To adjust the GraCoil® system for length of pull, perform the following:

1. Open the action and make sure the shotgun is completely unloaded.

2. With a 7/64" Allen wrench, loosen the two set screws on the right side of the stock plate by turning them counterclockwise one turn (Figure 25).

3. Loosen the buttplate by inserting a 3/32" Allen wrench into the single hole on the right side of the buttplate and turning the screw counterclockwise to loosen the screw (Figure 14). 

4. With your fingers, turn the large, threaded center shaft to adjust length of pull (Figure 26).

• Turn the shaft clockwise to decrease the length of pull.
• Turn the shaft counterclockwise to increase length of pull.

NOTICE: DO NOT USE A WRENCH OR PLIERS TO TURN THE CENTER SHAFT. DAMAGE TO THE SHAFT WILL OCCUR.

5. Length of pull adjustment is a matter of trial and error. Adjust in small increments until desired length of pull is reached.

6. When the desired length of pull has been achieved, tighten the two set screws on the stock plate using the 7/64" Allen wrench and single set screw on buttplate using the 3/32" Allen wrench. Do not overtighten the set screws.

7. It is possible that the settings on the recoil reduction unit of your shotgun may have changed after adjusting the length of pull. Before firing your shotgun, check to make sure your settings have not changed. If they have, refer to the last section and follow the directions to adjust the recoil reduction unit to your needs.

WARNING: BEFORE CHANGING TRIGGERS OR PERFORMING ADJUSTMENT PROCEDURES, OPEN THE ACTION AND MAKE CERTAIN THE CHAMBER IS UNLOADED. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

The Triple Trigger System has three interchangeable trigger shoes with different surfaces: Wide with checkered surface, wide with canted smooth surface and narrow with smooth surface. Each trigger shoe is adjustable to three positions for length of pull.

WARNING: BEFORE PERFORMING CLEANING PROCEDURES OPEN THE ACTION AND MAKE CERTAIN YOUR SHOTGUN IS COMPLETELY UNLOADED. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

WARNING: WEAR EYE PROTECTION WHEN DISASSEMBLING AND CLEANING YOUR SHOTGUN TO PREVENT SOLVENTS OR OTHER AGENTS FROM CONTACTING YOUR EYES, RESULTING IN INJURY.

WARNING: KEEP ALL AMMUNITION AWAY FROM THE CLEANING AREA. NEVER TEST THE MECHANICAL FUNCTION OF YOUR SHOTGUN WITH LIVE AMMUNITION. FAILURE TO FOLLOW THESE WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.

CLEANING PROCEDURES

Your BT-99 shotgun will function better and more reliably over a longer period of time if it is properly maintained and kept clean.  The barrel should be cleaned and the action wiped clean and lubricated after every day of shooting, and more often if it becomes excessively dirty. 

Normal maintenance can be accomplished with the barrel still attached to the receiver (lubricating and wiping down). More thorough cleaning requires removal of the barrel and forearm from the receiver (cleaning the barrel). 

If you encounter a function problem (tight action when closing, etc.) or if a malfunction occurs, perform a thorough cleaning and lubrication to see if it solves the problem before seeking the services of a Browning Recommended Service Center, the Browning Service Facility in Arnold, Missouri, or a qualified gunsmith.

1. Open the action and make sure the shotgun is completely unloaded. Keep the muzzle pointed in a safe direction.

2. Remove the barrel and forearm from the receiver as explained under the “Disassembly” section.

3. Using a shotgun cleaning rod with tip and patch large enough for a snug fit in the bore, lightly oil the patch and insert the rod in the breech end of the barrel and run back and forth several times in the barrel.

Browning offers a complete line of products to make cleaning your firearm fast and easy. Be sure to follow all instructions when using any product to clean your firearm.

4. Inspect the bore from both ends for leading and plastic residue that often remains in the bore from the shot cups in modern shotshells. Leading and plastic residue will appear as longitudinal streaks and are usually more predominant near the muzzle and just forward of the chamber. A normal amount of either is common and is not serious.

5. If leading or plastic residue seems excessive you can remove it by brushing the bore with a brass brush. Soak the brush or spray the bore with a powder solvent first. Scrub until clean. To prevent bristles from breaking off, push the brush fully through each time before pulling it back through.

WARNING: MOST SOLVENTS ARE HIGHLY FLAMMABLE. WEAR EYE PROTECTION AND PRACTICE APPROPRIATE SAFETY MEASURES WHEN WORKING WITH SOLVENTS TO AVOID SERIOUS INJURY.

6. After all leading and plastic residues have been removed, run a clean, dry patch through the bore. Follow this with a final, lightly oiled patch.

7. Wipe all metal surfaces of the receiver, forearm and barrels with a clean rag. Then lubricate your gun at the points described in Step 2 under the “Assembly” section. Regular lubrication is extremely important to the durability and reliable operation of your shotgun.

NOTICE: THE BROAD, POLISHED, FINELY FITTED SURFACES OF THE RECEIVER AND FOREARM MECHANISMS (BARREL LUGS, HINGE PIN AND  FOREARM BRACKET) MUST ALWAYS BE COATED WITH A FILM OF  HIGH QUALITY GREASE.

NOTICE: DO NOT PLACE LARGE QUANTITIES OF OIL INTO THE ACTION. EXCESS OIL WILL RUN BACK INTO THE WOOD OF THE STOCK AND SOFTEN THE WOOD, WITH CONSEQUENTIAL LOOSENING OF THE STOCK.

8. Inspect the barrel and chamber to be certain no patches have inadvertently been left in them. Remove any that remain.

9. The wood surfaces can also be wiped with a quality, lightweight gun oil or they can be polished with any quality furniture wax (but not both).

10. It is very important that the chamber of your shotgun be cleaned thoroughly and promptly after shooting plastic shotshells. Do not leave a discharged (empty) shell in the chamber for any length of time. The chemical composition of many plastic shells contains moisture which can “sweat” out of the shell and onto the chamber surface, and possibly cause corrosion and rust.

NEVER ATTEMPT TO TAKE YOUR FIREARM APART FURTHER THAN EXPLAINED IN THIS OWNER’S MANUAL. YOUR FIREARM IS A SPECIALIZED, FINELY FITTED MECHANISM. YOU MAY PERMANENTLY DAMAGE IT BY ATTEMPTING TO DISASSEMBLE THE INNER MECHANISM ASSEMBLIES. IF FURTHER DISASSEMBLY FOR SERVICE OR CLEANING IS REQUIRED, TAKE YOUR FIREARM TO A QUALIFIED GUNSMITH, OR CONTACT OUR ARNOLD, MISSOURI SERVICE FACILITY AS EXPLAINED UNDER THE “SERVICE OR REPAIR” SECTION.

Some BT-99 models feature a ported barrel that reduces recoil and muzzle jump. Carbon can build up in the ports after shooting. To clean them use a good quality powder solvent and pipe cleaners to scrub away debris. 

Keeping the oil-finished wood surfaces on your firearm looking their best requires only a small amount of maintenance. When the surfaces become spotted or dull, the affected area(s) can be treated using rubbing alcohol on a soft, lint free cloth and allowed to dry. A small amount of a linseed oil-based finish, such as Watco® Danish Oil Finish, Deft® Danish Oil Finish, or Formby’s® Tung Oil Finish should then be applied to the surface of the wood with a soft, lint free cloth according to the manufacturers’ instructions. To treat the checkering, a small amount of oil-based finish can be applied and then distributed evenly using a toothbrush or other soft bristled brush.

As with any gun, the only way to preserve its pristine condition and collector appeal is to never handle or fire it, which in turn would deprive you of much of the enjoyment that comes with owning a fine Browning firearm. 

While special finishes such as engraving and gold plating greatly enhance the aesthetic appeal of your shotgun, please be aware that they are no more durable, and in some cases may even be slightly less durable than more common gun finishes. 

As you use your Browning shotgun, you can expect special finishes to wear in much the same manner as any other firearm finish. These marks are the honest product of the hours spent enjoying your firearm and each scuff and scratch will probably have a good story to go along with it.

If your firearm should require service or repairs, we suggest you first contact a local recommended Browning Firearms Service Center. To locate a service center visit browning.com, contact our Customer Service Department or your Browning firearms dealer for the address of the Service Center nearest you. Otherwise, you may send your firearm directly to our Service Department in Arnold, Missouri. 

Parts listings, Firearm Service Center lists, service procedures, service/repair form and general product information are also found on the internet at browning.com. For technical questions about your firearm or service, contact:

When returning your firearm for servicing, you must do the following:

1. Be sure it is completely unloaded.

2. Remove any optics, optic mounts or other accessories.

3. Package it securely in a cardboard container.

4. Enclose the service/repair form available at browning.com or a letter that clearly describes the trouble experienced, the ammunition used and the repairs desired. Also include your name, e-mail address (if possible) and a daytime phone number where you can be reached.

5. Never return ammunition with your firearm. It is against postal and most commerce regulations.