Aim Sports AR Complete Upper 5.56x45mm NATO Black Nitride 15" M-LOK - The AR Complete Upper Receiver with BCG features a Mil-Spec anodized upper with 16" SOCOM profile 4150 chorme moly vanadium barrel, and 15" M-LOK free-float handguard. The barrel also has a nitride finish, M4 feed ramps, and A2 flash hider. This product includes the upper, charging handle, and BCG
Specifications:

Type	Complete
Caliber	5.56x45mm NATO
Sights	None, Optic Ready
Barrel Length	16"
Barrel Material	4150 Chrome Moly Vanadium Steel
Twist	1:8"
Barrel Description
Barrel Finish	Black Nitride
Receiver Description
Receiver Finish	Black Hard Coat Anodized
Handguards	15" M-LOK Free-Float
Handguard Finish	Black Hard Coat Anodized
Barrel Length Range	16" to 16.99"