An AR-10 flash hider is a muzzle device for AR-10 rifles in .308 Win or 7.62×51 NATO. It reduces visible muzzle flash when you fire the rifle. The device vents gases away from the shooter’s line of sight. This helps you stay on target in low-light conditions. The AR-10 flash hider fits threaded .308 barrels with a 5/8″ x 24 thread pitch. It works with AR-10 upper receivers and handguards. It is a popular upgrade for tactical, hunting, and competition builds.