Agency Arms 417 Compensator, Features a Single Top Venting Port and a Front Sight Hole, Fits GLOCK 43, Two Set Screws with an Allen Wrench and a Vial of Rockset are Included in package, Matte Finish, Black, Standard 1/2 x 28 Thread Pitch 417S-G43-BLK The Agency Arms 417C Compensator is threaded with the standard 1/2x28 thread pitch (Overall barrel protrusion should be 0.637" +/- 0.005" for optimal fitment and function). It is available in a two chamber design (2 vertical ports and 2 side venting ports) or a single chamber design (1 vertical ports). It is designed to utilize the OEM recoil spring assembly and it also features a front sight hole, allowing you to transfer your existing front sight from your slide to the comp. The 417C is specifically designed to fit the GLOCK 43/43X/48.