Agency Arms 417 Compensator Features Two Chamber Design-2 Vertical Ports and 2 Side Venting Ports Front Sight hole Two Set Screws with an Allen Wrench and a Vial of Rockset are Included in Package Matte Finish Black Fits Glock 17/19/19X/34/45 Gen 5 Standard 1/2 x 28 thread pitch 417-5-BLK