The Agency Arms 417 Compensator is threaded with the standard 1/2x28 thread pitch. It features a single top venting port and it also features a front sight hole. It is designed to utilize the OEM recoil spring assembly and the front sight hole allows you to transfer your existing front sight from your slide to the comp. Compatible with the 17, 19, 26 and 34 Gen 3. Includes417 Comp (Generation specific) 2 Set Screws with an Allen WrenchVial of Rocksett 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.