This is the newest generation of suppressors for the law enforcement community. The SPECOP-4 is designed as a modern, high efficiency, compact accessory for the Colt M4 carbine and the Ruger AC-556 assault rifles. The suppressor mounts on the muzzle threads in place of the flash hider and has a collet that tightens around the barrel preventing inadvertent unscrewing during firing. Designed for semiautomatic and limited fully automatic fire, the SPECOP-4 is built from corrosion resistant high nickel alloy steels in a matte black oxide finish. Available in 1/2x28 (Colt M4) and 9/16x24 (Ruger) threads only.