Machined from 4150 steel with a corrosion-resistant phosphate finish, the Bravo Company A2X Flash Hider 5.56mm - 1/2x28 is an easy-to-install flash hider, engineered to mitigate muzzle flash with your AR-15/M4 rifle. The predrilled pin hole at the base allows for permanent installation, while the deburred design eliminates all burrs and snags for improved reliability and consistent service. 1/2x28 threads. Order now.