The AR-Stoner AR-15 M 16” Barrel Assembly is ready for installation onto a host upper receiver. Chambered in 5.56x45mm NATO, this barrel is fully compatible 5.56 or .223 Remington ammunition. Assembled with an A2 flash hider, A2 front site, handguard end cap, delta ring assembly and barrel nut this is a great step toward finishing your build. The barrel is constructed of 4150 chrome moly steel and features a Melonite coating. This coating provides a thin protective surface, which reduces bore friction, increases accuracy and extends barrel life. The AR-STONER™ AR-15 M4 16” Barrel Assembly is an excellent choice for a general-purpose AR build that is perfect for the range, 3-Gun matches, or pursuing game.