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The Griffin Armament M4SD muzzle devices interface with Griffin's M4SD series of silencers. The revised M4SD Flash Suppressor provides M4SD sound suppressor end users a high-performance flash suppressor/compensator alternative to compatible A1/A2 “Birdcage” flash suppressors. The M4SD flash suppressor provides optimal suppressor fit, enhanced flash signature reduction, and eliminates muzzle climb. CNC machined and outside diameter ground from heat, corrosion, and wear resistant, precipitation hardened, 17-4 stainless steel for maximum durability. Compatible with the M4SD series SD-QD suppressor interface 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 2.4 ounces Materials 17-4PH Stainless Steel Finish Black Oxide Attachment 1/2×28 Thread