The Knights Armament 762 QDC/CQB suppressor provides suppression in an ultra short package. The idea behind the QDC / CQB is to keep the overall length of your firearms at a bare minimum while providing effective flash and sound suppression. Consistent and minimal point of impact shift is obtained using KAC's advanced QDC (quick disconnect coupling) mounting system that is also used on their larger 762 QDC suppressors.