KNIGHT'S ARMAMENT MCQ-2 5.56 NATO RIFLE SUPPRESSOR The 5.56 MCQ-2 packs an incredible amount of performance into a small, lightweight, low-backpressure suppressor. At only 3.9" in length, it adds only 2.4" and 12.7 oz. to the host system. Pressure Reduction Technology (PRT) ensures that bolt carrier velocity and cyclic rates of fire are nearly identical to the system's unsuppressed performance, while reducing operator exposure to harmful combustion gasses. With an "At Ear" sound pressure level of 141 dBA, and a muzzle sound pressure level of 148 dBA, a single layer of hearing protection is adequate for unlimited exposures. The Quick Detach Mfg: Knights Armament