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Barrel material: Double-lapped chrome moly vanadium MIL-B-11595-E with M2023 stepdown; threaded 1/2 x 28 Upper receiver: Forged 7075-T6 aluminum flat-top with MIL-STD 1913 rail Lower receiver: Forged 7075-T6 aluminum specs Armalite® Defensive Sporting Rifle 15F 5.56 NATO/.223 Remington Semi-automatic AR Rifle Each DEF15F Rifle comes standard with double-lapped, chrome-lined barrel for superior accuracy, collapsible stock for custom length-of-pull, and flash suppressor. In the Era of AR Innovation, Armalite will not be outdone in quality OR value! Lightweight…just 6.35 lbs. High-quality double-lapped chrome moly vanadium barrel shoots great and keeps fouling to a minimum Barrel is 1/2 x 28 threaded, and includes a thread protector MIL-STD 1913 rail on the receiver for optics Includes one 30-rd. magazine Backed by the Armalite Limited Lifetime Warranty Order today! Key Specifications Item Number: 644992 Caliber: 5.56 NATO/.223 Remington Action: Semi-automatic Capacity: 30+1 Barrel length

William, the Armalite Barrel is 4150 Chrome Moly Vanadium