Highly-efficient internal helical design uses ten precisely contoured longitudinal ports combined with a unique, cloverleaf-shaped exit port to trap unburned powder particles long enough for full burn and dissipation of hot combustion gasses. Muzzle flash cancels itself out to minimize shooter exposure during daytime and low-light situations. Also serves as a compensator by directing venting gasses to help reduce muzzle jump and improve shooter control for better shot placement. Precision machined from 4140 steel to stand up to rough tactical operations. 2-1/8" overall length brings a 14½" barrel up to legal length for civilian use when flash suppressor is permanently pin Mfg: Vltor Weapon Systems SPECS: Steel, matte black Parkerized finish. 2-1⁄8" (5.4cm) long, .856" (2.2cm) O.D. Includes crush washer. VC-301 fits AR-style .308/7.62mm rifles with 5⁄8"-24 tpi threaded muzzle.