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Hi Russ and welcome. This barrel is Blued. 16" Lightweight Profile Barrel with M4 Feed Ramps, 1:9 Twist with Threaded Muzzle and A2 Flash Hider and a Manganese Phosphated Barrel Finish.

Russ, this has a Manganese Phosphated Barrrel. . Barrel: 4140 Melonite Steel 16" Length, 1x9 Twist Carbine Gas System Threaded Muzzle, A2 Flash Hider Manganese Phosphated Melonite under DTI Low Profile Gas Block Lightweight Profile . Bolt & Carrier: Phosphated 8620 Steel Carrier Assembly Carpenter 158 Bolt Mil-Spec Chrome Lined Carrier Interior Carrier Key - Chrome Lined, attached with Grade 8 Screws Properly Staked & Sealed Gas Key . Stay safe & have a great day!