Aero Precision Gamma, MB, 223 Remington, 556NATO, Black, Nitride APVG200001A The VG6 GAMMA 556 is a high-performance muzzle brake for eliminating recoil. It was designed using state of the art engineering techniques" utilizing CFD (Computational Fluid Dynamics) and CAE (Computer Aided Engineering). This product is 100% CNC machined for optimal performance. The GAMMA 556 is a muzzle brake and compensator hybrid that virtually eliminates recoil and muzzle movement during firing. The unique combination of both muzzle brake and compensator functionality inspires shooter confidence and allows for quicker follow up shots. The GAMMA 556 is optimized to efficiently utilize gas from the muzzle on 10.5-18.5" barrel lengths making it a perfect addition to almost any build. Updated chamber design features improved gas flow and rigidity. By leveraging modern design principles both functionally and aesthetically" They continue to keep the VG6 product family at the cutting edge of muzzle device performance.