The VG6 GAMMA 9mm sets a new standard when it comes to recoil management by virtually eliminating any muzzle movement.This muzzle brake / compensator hybrid virtually eliminates recoil and minimizes muzzle movement. The unique combination of both braking and compensating features inspire shooter confidence and allows the shooter to make very fast follow up shots. Its unique porting design has been optimized for the pressures of 9mm, providing a very soft feel in the shoulder thanks to gas ports dimensions that have been strenuously tested to give the utmost control to the muzzle.Features: Material: 17-4ph(R) Heat Treated Stainless Steel Finish: BLACKNITRIDE(TM) - Satin Finish(Half Gloss) Surface Hardness: 68RC Caliber: 9mm only Thread: 1/2-28 RH Weight: 4.8oz Includes crush washer