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The Griffin Armament M4SD muzzle devices interface with Griffin's M4SD / 30SD series of silencers and QD Blast Shield. The M4SD muzzle brake provides high efficiency recoil reduction and two durable, sacrificial baffles for use inside M4SD /30SD sound suppressors. CNC Machined and outside diameter ground from high strength, corrosion and wear resistant, 17-4 precipitation hardened stainless steel. The M4SD muzzle brake is black oxide finished. 1/2×28 threads offer compatibility with most 5.56mm Ar-15/M-4 carbine family weapons. Overall length of 2.25" will bring 14.5" barrels to the minimum legal length of 16.1" when permanently attached. Includes shim set and over-travel stop washer. Over-travel stop tab should be positioned at the bottom of the muzzle device 6 Oclock.Specs Diameter .863″ OAL 2.25” Weight 2.7 ounces Materials 17-4PH Stainless Steel Finish Black Oxide Attachment 1/2×28 Thread