Designed to meet Customer's needs, the AR-STONER AR-15 A3 Upper Receiver Assembly provides function, style and affordability for today's AR-15. The A3 upper attaches to virtually any standard AR-15 lower receiver and comes complete with everything you need to start shooting. This upper features a rifle-length gas system, 20" barrel with 1:7" twist and matte finish, removable A2 flash hider, and a 2 piece handguard. Finish building the gun of your dreams at a price that won't break the bank with the AR-STONER AR-15 A3 Upper Receiver Assembly. Features:Chambered in 5.56x45mmA3 Upper Receiver with Carry Handle20" barrel with 1:7" twistDetachable Carry Handle Note: Flash Hider May Vary Between Standard and Spiral Bird Cage.