A short and extremely durable suppressor, the HX-QD 556k is updated with their newly designed flash cap and is built with patented and proven Flow-Through technology, delivers sub-140 dB and zero flash performance, is full-auto rated, easily passes the USSOCOM Reliability Stress Test, and has no minimum barrel restrictions - its designed and built for extreme use.Features :556 NATOFull-Auto ratedIncludes 1/2-28 556 Flash Hider