Fits Mossberg 500/535/590/835 12ga & 20ga Maverick 88 12ga & 20ga,Remington 870/887 12ga,Winchester SXP 12ga. For the Winchester 1200/1300 12ga & 20ga you will need an additional adaptor. SXP model year 2021 and newer will require modification to the adaptor before assembly to the shotgun. SXP Model year 2020 and older no modification needed. Most Savage Stevens 320 12ga before 2016, For the Savage 320 Shotgun adapter 2017-current you will need an additional adaptor. TriStar Raptor 12ga Charles Daley 301 Pump-Action Field Shotgun 12ga Shotguns. Does Not Fit .410 Gauge Shotguns