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It is the heavy profile barrel from windham site see ***** Model: R11FTT 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 Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard Receiver Finish: Hardcoat Black Anodize Finish Bolt Material: Carpenter 158 Steel *******Barrel: 11.5" Heavy Profile, Chrome Lined with A2 Flash Suppressor Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps Rifling: 1 in 9" – Right Hand Twist Stock: 6-Position Telescoping Buttstock Forend: M4 Fiberglass Double Heat Shield Hand Guard Pistol Grip: A2 Black Plastic Grip Rear Sight: None – Ready for optics or other type accessory sights Front Sight: None – Ready for optics or other type accessory sights Weight / Length: 6.0 lbs. (with

Jay, this firearm has a 10 inch Heavy Profile Chrome Lined barrel. Barrel Material is 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps.