This R3 Flash Hider 7.62 features variable fluted prongs, which yield zero ring and world-class flash reduction in a light and compact size. The R3 Flash Mitigation System utilizes Rugged Suppressors' snag-free, toothless Dual Taper Locking System making it compatible with all of our rifle and multi-caliber suppressors. *This muzzle device is long enough to permanently attach to 14.5a ^2 barrels bringing them to 16a ^2