The Agency Arms 417 Single Port Compensator is threaded with the standard 1/2x28 thread pitch (Overall barrel protrusion should be 0.715" +/- 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, 19X, 34, and 45. (NOT COMPATIBLE WITH CONVERSION BARRELS) DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.