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Brownells has a variety of popular lengths available for its Lightweight Carbine Barrels. These barrels are designed for fast handling and are made from button rifled 4150 Chrome Moly Vanadium steel profiled to Brownells specifications by Rosco Manufacturing. They feature a 223 Wylde chamber, which allows them to work well with both 223 Remington and 5.56x45mm NATO ammunition. Furthermore, they have the versatility to handle Full Metal Jacket 55gr loads and heavier, premium 77gr bullets, thanks to their 1-8 twist. Each barrel has a .625 gas block journal, which corresponds with their overall slim profile. This design prevents the carbine from becoming front heavy. Additionally, they have ½-28 muzzle threads that accept common muzzle devices, and their M4 feedramps interface perfectly with M4 feedramps in your upper receiver. The Nitride finish is durable, and it prevents corrosion, which makes cleaning easier. It also has an extra hard surface that prevents the barrel from getting dings and nicks. You can have confidence in the Brownells Lightweight Carbine Barrels, and they come with an original purchaser lifetime guarantee.