The MASS DRIVER COMP is a counter recoil compensator that does not require a threaded barrel, is 50 state legal, and is designed to reduce felt recoil and prevent damage to the pistol slide.
It is compatible with GLOCK™ GEN3 OR GEN5 G19 and G17 slides and can be used with most open-ended holsters; installation is recommended to be done by a gunsmith or armorer.
Using the compensator with +P and +P+ 9mm ammunition will lead to premature wear of the internal spring and potential failure; a recommended torque value for the guide rod nut is 25 lbs/in.