The Patternmaster Code Black Turkey uses several different technologies to achieve incredible down range energy at distance. Pattern Master has worked hard to continue to develop a Turkey pattern that performs like no other. They understand that sometimes your entire season can come down to a few more yards and that s why The Patternmaster Code Black Turkey uses their Separating Ring technology as well as their proprietary canoe-porting in order to shorten the shot-string by as much as 75% over other constriction tubes while also improving the effective range. The Code Black Turkey is built from titanium infused 17-4ph Stainless Steel and more than 100 years of combined experience. This American Made, aircraft quality steel is the best in the world and allows for unmatched performance and durability. *For best results, Ballistic Performance, LLC, recommends ammunition velocities below 1550fps *NOT FOR USE WITH STEEL SHOT OR SLUG AMMUNITION Compatibility Akkar 12ga Charles Daly 12ga (Current production Semi Auto and Pump) Charles Daly (Made in Turkey) 12ga (Current production O/U) H and R 12ga Excell Auto 5 (with threads at bottom of factory choke) Legacy Sports 12ga Threads at bottom V-3 New England Firearms 12ga (Factory flush mount choke 2" long) Remington 12ga 870, 1187, and 1100, V3 Remington 12ga V3