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Yes this is a heavy barrel according to the upc number, the features on this rifle "Windham Weaponry AR-15 Heavy Barrel Carbine Features AR15 Rifle Heavy Barrel Carbine Caliber: .223 Rem. / 5.56mm NATO Action: Semi-Automatic, Gas Impingement System Capacity: 30 + 1- Ships with one 30 Round Magazine (accepts all std. sizes) Safety: Manual Lever with Indicator Markings on Both Sides of Receiver Receiver: M4A4 Type Flat Top Upper Receiver with Detachable Carry Handle Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard Receiver Finish: Hardcoat Black Anodize Finish Barrel: 16" Heavy Profile, Chrome Lined with A2 Flash Suppressor"

Sean, yes Sir. 16" Heavy profile chrome lined barrel - 4150 Chrome moly vanadium with M4 feed ramps - 1:9" twist with 6 grooves and lands - A2 flash suppressor. Cheers and stay safe!

Full specs here https://www.windhamweaponry.com/firearms/rifles/223-556-caliber-rifle/hbc/

Yes sir, heavy barrel chrome lined 1/9 twist that can shoot either 5.56 or 223 rem.