“Agency Arms Gen4 Compensator, Features two chamber design-2 vertical ports and 2 side venting ports, Front sight hole, Two set screws with an Allen Wrench and a vial of Rockset are included in package, Compatible with the Glock 17/19/34, Standard 1/2 x 28 thread pitch, Black finish 417-4-BLK” has been added to your cart. View cart