CNC machined muzzle break featuring three expansion chambers provide up to 45% reduction in felt recoil. The large expansion chambers are easily cleaned, a must for high volume shooters. They also have a solid bottom to eliminate dust and debris generated by muzzle blast. Only adds 1-1/4" to barrel. Please note this is not a drop-in part. The shoulder should be faced for proper timing and the bore diameter will need to be drilled to match your application. Gunsmithing is required.