The Agency Arms 417C Compensator is threaded with the standard 1/2×28 thread pitch (Overall barrel protrusion should be 0.637″ +/- 0.005″ for optimal fitment and function). It features a 2 chamber design (2 vertical ports and 2 side venting 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 for the Glock® 43.