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Brownells Premium Lightweight Carbine Barrels are specially made for hard use with a premium barrel configuration. The bore and chamber are coated with classic hard chrome, making it resistant to corrosion, easy to clean, and preventing long-term wear. Manufactured by Ballistic Advantage based on Brownell's specifications and quality standards, these barrels come in multiple popular lengths to fit any new carbine build. The barrels have an exterior phosphate finish that provides an excellent matte finish and retains oil extremely well. The button rifled barrels are made from 4150 Chrome Moly Vanadium steel, with a 223 Wylde chamber that accommodates both 223 Remington and 5.56x45mm NATO ammunition equally well. The 1-8 twist is suitable for commonly available Full Metal Jacket 55gr loads, as well as heavier 77gr bullets. The barrels have a .625 gas block journal to correspond with the overall slim profile, preventing your Carbine from becoming front heavy. The ½-28 muzzle threads accept common muzzle devices, and the M4 feedramps interface seamlessly with those in your upper receiver. Brownells backs their Premium Lightweight Carbine Barrels with our original purchaser lifetime guarantee, so you can have confidence in your purchase.