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The Brownells Lightweight Carbine Barrel is ideal for fast handling and lightweight applications. This barrel is available in popular lengths and can be used for any new carbine build. Rosco Manufacturing makes these Brownells barrels adhering to the manufacturer's specifications. These offer button rifled profiles created from 4150 Chrome Moly Vanadium steel. Moreover, the barrel features a 223 Wylde chamber, making it suitable for 223 Remington and 5.56x45mm NATO ammo. The 1-8 twist delivers excellent performance with Full Metal Jacket 55gr loads, and premium 77gr bullets. The .625 gas block journal corresponds with the slim profile, ensuring that your Carbine is not front heavy. The ½-28 muzzle threads are compatible with common muzzle devices, and the M4 feedramps are a perfect match for those in your upper receiver. This Lightweight Carbine Barrel has a durable Nitride finish that prevents corrosion, eases cleaning, and most importantly, provides a hard surface to prevent dings and nicks. Brownells' Lifetime Guarantee covers these barrels, ensuring that original purchasers have complete confidence.