The Agency Arms 417 Compensator is threaded with the standard 1/2x28 thread pitch (Overall barrel protrusion should be 0.695" +/- 0.005" for optimal fitment). It features a single top venting port and it also features a front sight hole. It features a front sight hole, allowing you to transfer your existing front sight from your slide to the comp. Compatible with the 17,19 and 34. (NOT COMPATIBLE WITH CONVERSION BARRELS)Compensator may require tuning of Recoil System. Designed to work with most factory loaded ammunition but will yield the best results with a heavier charged ammunitionThe package includes:417 Single Port Comp (Generation specific)2 Set Screws with an Allen WrenchVial of Thread Locker