The HX-QD 556 is the optimal choice for the widest range of 5.56 caliber rifles. Focusing strongly on a maximum sound performance, the HX-QD 556 is ideal for shooters who are more concerned with maximum suppression over size and weight. As with all of the OSS Helix style silencers, the patented Flow-Through technology of this silencer redirects the expanding gasses in a helical pattern allowing the gas to expand and cool as they move through the silencer body. This unique design also means that the expanding gas generate torque on the silencer and snugging it onto the mount. As the gas moves through the 17-4 stainless ...