This is a complete AR-15 upper chambered for 5.56mm, with a 16" medium-profile barrel of 4140 ChroMoly steel, so the top half of your build arrives assembled. The barrel carries a Melonite finish and a 1:7 twist, and it uses an M4 feed ramp barrel extension. A carbine-length gas system with a .750 low-profile gas block keeps the gas hardware slim under the handguard. The muzzle is threaded 1/2x28 and wears an A2 flash hider, so you can swap in another 1/2x28 muzzle device later.

The upper receiver is billet 7075 T6 in an M4 Mil-Std style, finished with Type III anodizing and offered in black. A forward assist and a dust cover are built in, giving you the standard tools to seat a round and keep debris out of the ejection port. The 15" free-float M-Lok thin rail handguard does not contact the barrel, and its slim profile and M-Lok slots let you mount accessories. A BCG is included, so the upper is ready to pair with a lower.

• Brand: Combat Armory
• Caliber: 5.56mm
• Barrel Length: 16" 4140 ChroMoly, medium profile, 1:7 twist, Melonite finish
• Handguard: 15" free-float M-Lok thin rail
• Upper Receiver: Billet 7075 T6, M4 Mil-Std style, Type III anodizing
• Included Item: BCG
• Finish: Black