Agency Arms 419 Compensator, Features 1 Vertical Port, Fits Sig Sauer P320, Matte Finish, Black, Includes Two Set Screws with an Allen Wrench and a vial of Thread Locker AGE419S-OEM-BLK The Agency Arms 419 Compensator is threaded with the standard 1/2x28 RH thread pitch (Overall barrel protrusion should be 0.819" +/- 0.005" for optimal fitment). It is available in a two chamber design (2 vertical ports) or a single chamber design (1 vertical port). THIS PRODUCT IS SPECIFICALLY DESIGNED TO FIT BEST WITH AN OEM P320 SLIDE AND IS NOT COMPATIBLE WITH CONVERSION BARRELS