Shotgun Choke Tubes

Shotgun Choke Tubes

STANDARD INVECTOR, INVECTOR-PLUS AND INVECTOR-DS ARE NOT INTERCHANGEABLE. Make sure you know the system that fits your shotgun before proceeding.  For advice on choosing a choke tube appropriate for your shotgun READ MORE HERE. 

Browning has been a leader in interchangeable choke tube systems since the 1980s. Today we offer three systems: our legacy Standard Invector, time-proven Invector-Plus, and extreme-performing Invector-DS.

We offer extensive selections of tubes in each system to provide you with optimal patterns. It's worth the effort to find the right tube. Here's what you do: 

  1. Select the Browning choke system which your shotgun is designed to accept.
  2. Select from the choke tube constrictions and designs for your system in your gauge. 

Total Barrel Dynamics is the combination of Vector Pro forcing cone lengthening, Back-Bored Technology and an Invector interchangeable choke tube system working in unison to improve shot pattern performance. Each component of Total Barrel Dynamics plays a part to reduce shot deformation and keep patterns dense, putting more pellets on your target. To ignore any single aspect of the system weakens the overall performance. Look for Total Barrel Dynamics on A5, Maxus, BT-99 and on 12 and 20 gauge Citori 725, Citori and Cynergy models.


  • The forcing cone is the tapered transition between the chamber and the bore that constricts the shot column. The longer the forcing cone is, the more gradual the constriction. Vector Pro is better than our competitors’ forcing cone designs because it has a more gradual constriction.
  • The Vector Pro forcing cone reduces stress on the shot column as it moves into the bore, reducing pellet deformation for more uniform patterns and more pellets in the center of the pattern.
  • Lengthening forcing cones is a popular and expensive aftermarket practice done to increase shot pattern performance, but it comes standard on A5, Maxus, BT-99 and on 12 and 20 gauge Citori 725, Citori and Cynergy models.


  • Back-boring enlarges the bore to the maximum diameter to increase shot velocity and minimize pellet deformity for more uniform patterns and a reduction in felt recoil.
  • Extensive testing has shown that Back-Bored Technology reduces the friction between the shot cup and the bore, but does not allow gases to slip past the shot cup that would result in reduced pellet velocity and blown patterns.
  • Back-Bored Technology specifications minimize shot deformation and maximize pattern uniformity, consistency and density. Back-Bored Technology is standard on A5, Maxus, BT-99 and on 12 and 20 gauge Citori 725, Citori, Cynergy, BPS and Silver models.
Browning Barrel Dynamics Illustration
Browning Barrel Dynamics Illustration