The long awaited Knight's Armament 5.56 QDC sound test.

KACís line of QDC (Quick Disconnect Coupling) suppressors are currently in service with various SOF and Law Enforcement agencies, and feature an innovative mounting method, providing the user with consistent and minimized POI shift, and effective flash and sound suppression. The attachment method separates the locking parts from mounting surfaces, making carbon build-up a reduced concern. Consistent POI shift is maintained through repetitive lock-up of the mounting hardware during attachment. The QDC line of suppressors is available in two sizes; standard QDC for optimal flash and sound reduction, and shorter CQB for better maneuverability in confined spaces.