From SUREFIRE - This muzzle device is excellent as a stand-alone muzzle brake, but also serves double duty as an attachment point for a Surefire quick detachable (QD) sound suppressor. It greatly diffuses side muzzle blast, as well as controlling upward/sideways movement. It features exacting tolerances for minimal shift in zero, regardless of the number of times a suppressor is attached/detached. Its high resistance to heat ensures years of reliable use.

120 Shipped. Paypal.

NIB. Never mounted. Brand new.

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https://www.skdtac.com/SureFire-MB55...-p/sur.606.htm