Our Glock 9mm Compensator is designed and tested to reduce recoil and muzzle flip. Theyre lightweight yet ultra strong weighing in at only 2.6 oz. Fits standard Glock 9mm 1/2-28 threading. Product Details Fits standard Glock 9mm 1/2-28 threading Includes Allen Wrench for screws Weight: 2.6 oz. Length: 1.2 in. Check out the install video Here .