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The M4SD suppressor is back- providing the original project goals- an affordable, sound suppressor with support for compatible A2 compensators. The M4SD retains the welded, 17-4 billet construction and is as durable as the flagship suppressor. Full auto rated, equipped with a user friendly snap on interface, backed by an extensive muzzle device family- the M4SD suppressor is a great suppressor for the entry level NFA enthusiast desiring a QD interface. The M4SD mounting system does not suffer from the wear prone issues of ratcheting systems common to the marketplace.Specs Diameter 1.5″ Overall Length 6.6" Weight 17.1 ounces Materials High Strength, High Temp, Corrosion Resistant 17-4PH Stainless Steel Attachment Griffin M4SD Mounts and A2 Nato spec compensator Finish Griffin Endura-Kote Attenuation 32DBFeatures