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This AR-Stoner carbine barrel features a 5.56x45mm NATO chamber for full compatibility with surplus mil-spec ammunition or commercial 223 Remington ammunition. These barrels are constructed of 4150 chrome moly steel with a threaded muzzle and barrel extension which features M4 Feed Ramps. Additionally, these barrels feature a melonite coating which provides a thinner surface than chrome-lining, so bore friction is reduced for better accuracy. In addition, melonite is harder than chrome-lining providing a longer wear life. Technical Information Barrel Length: 16"Material: 4150 Chrome Moly SteelGas Tube Length: CarbineGas Block Diameter: 0.750"Twist Rate: 1 in 7"M4 Feed Ramps: YesMuzzle Thread: 1/2"-28 from Midway USA (Product 529337)

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