MCQ-1 5.56 NATO RIFLE SUPPRESSOR With an additional length of only 2.33" beyond a 3-prong QDC flash-hider, added weight of 13.9 oz., and the low backpressure of the Pressure Reduction Technology (PRT) design, adding the Mini Close Quarters (MCQ) signature reduction device to a system will have negligible impact to function and handling. Dropping short barreled rifle SPL (sound pressure level) to under 145 dBA at ear, common single layer hearing protection is adequate for comfortable and safe high-density use. Low retained bore pressure ensures that bolt carrier velocity and cyclic rate of fire are nearly identical to unsuppressed use, with significantly reduced noxiou Mfg: Knights Armament