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.
The Standard Invector interchangeable choke tube system offers consistent, dense shot patterns with the right constriction needed for the shooting situation. Standard Invector is standard on 10, 16 and 28 gauge, and .410 bore Citori 725, Citori, Cynergy and Gold shotgun models.