The Agency Arms 417C Compensator is threaded with the standard 1/2×28 thread pitch. 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. The package includes: 417C Comp 2 Set Screws with an Allen Wrench Vial of Rocksett