The Griffin Armament M4SD muzzle devices interface with GATE-LOK suppressors (M4SDK M4SD2 30SD and 30SDK) as well as the QD Blast Shield. - This revised generation 3 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 reduces muzzle climb. The focus of the Gen 3 revision was to reduce flash as much as possible. Time intensive R&D resulted in a high performance 3 prong flash hider with incredible resonance reduction. These hide flash extremely well and do not ring or ping when fired.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 GATE-LOK suppressor interface - Includes shim set and over-travel stop washer. This muzzle device is pre drilled for pinning and welding to a 14.5 barrel to achieve a 16 non NFA length carbine. - Over-travel stop tab should be positioned at the bottom of the muzzle device (6 Oclock). - Diameter: .863 - OAL: 2.25 - Weight: 2.4 ounces - Materials: 17-4PH Stainless Steel - Finish: Black Nitride - Attachment: 1/2x28 Thread - Ambidextrous QD Mount - Free of wear prone geometry - Precisely calculated porting to neutralize muzzle movement - 17-4 PH Stainless steel to withstand hard use - Lustrous Black Oxide Finish - Griffin Laser Logo Marked - 1/2x28 industry standard Thread Pitch for 5.56mm carbines - Shim set Included - Over-Travel stop washer Included - Compatible with M4SD2 M4SDK 30SD and 30SDK suppressors