Thread-on muzzle devices give the tactical rifle shooter a variety of options for flash suppression to meet his exact needs. Precision CNC machined to exact tolerances from high-quality stainless steel alloy that withstands extreme heat and gas particle erosion, even after thousands of rounds. Stands up to the intense tempo of combat conditions without loss of performance. Easily replaces factory flash suppressor on military-configuration AR-15/M16/M4/AR-style .308 rifles with no permanent modifications to gun. Install on other assault rifles, semi-autos, and bolt actions with muzzle threaded to accept the device. Not only improves the performance and enhances the appearance of your rifle Mfg: Surefire SPECS: Heat-treated stainless steel, matte black finish. Fits rifles with threaded muzzles only. Crush washer set, tube of Rocksett heat-resistant thread locker, and complete instructions included.