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Introducing the Brownells Premium Lightweight Carbine Barrels that provide top-notch features tailored for any new carbine build. Available in popular lengths, these barrels are crafted by Ballistic Advantage in accordance with Brownell's specifications and strict quality standards to ensure customers get the best. The exterior of the barrel boasts a standard phosphate finish that guarantees a matte appearance and retains oil effectively. The most critical component, the bore and chamber, is hard chromed to protect against corrosion and reduce wear, and the button-rifled barrels are profiled from 4150 Chrome Moly Vanadium steel. Featuring a 223 Wylde chamber suitable for 223 Remington and 5.56x45mm NATO ammunition, the 1-8 twist caters to Full Metal Jacket 55gr loads and hefty 77gr bullets. Additionally, the .625 gas block journal maintains an overall slim profile, preventing your Carbine from becoming heavy in front. The barrels have ½-28 muzzle threads that accommodate different muzzle devices, and the M4 feedramps at the opposite end function seamlessly with M4 feedramps in your upper receiver. Sold with an original purchaser lifetime guarantee, choose the Brownells Lightweight Carbine Barrels with confidence.