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Brownells Lightweight Carbine Barrels are made for those who need a quick-handling, lightweight barrel. These barrels come in various popular lengths and are perfect for any new carbine build. Rosco Manufacturing manufactures them according to Brownells' specifications. The button rifled barrels are constructed from 4150 Chrome Moly Vanadium steel and come with a 223 Wylde chamber that can accommodate both 223 Remington and 5.56x45mm NATO ammunition. The 1-8 twist can accommodate common Full Metal Jacket 55gr loads, all the way up to heavier, premium 77gr bullets. These Lightweight Barrels come with a 0.625" gas block journal to match the overall slim profile so that your carbine doesn't become front-heavy. They also feature 1/2-28 muzzle threads that can accept popular muzzle devices, and the M4 feed ramps at the opposite end of the barrel interface perfectly with M4 feed ramps in your upper receiver. A durable Nitride finish protects against corrosion, eases cleaning, and provides an extra hard surface to prevent dings and nicks, making the Brownells Lightweight Carbine Barrels a reliable choice. Furthermore, they are backed by our original purchaser lifetime guarantee!