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Brownells offers Premium Lightweight Carbine Barrels in various lengths, suitable for any new carbine build. Manufactured to Brownell's specifications and quality standards by Ballistic Advantage, these barrels have a standard phosphate exterior coating that provides an excellent matte finish and retains oil very well. The most important part of the barrel, the bore and chamber, are hard chromed, which prevents corrosion, makes cleaning easy, and prevents wear over the long term. The button rifled barrels are made of 4150 Chrome Moly Vanadium steel and feature a 223 Wylde chamber, allowing them to accommodate both 223 Remington and 5.56x45mm NATO ammunition equally well. The 1-8 twist is capable of handling commonly available Full Metal Jacket 55gr loads, and also heavier premium 77gr bullets. All of these Lightweight Barrels have a .625 gas block journal, which corresponds with the slim profile, preventing your Carbine from becoming front heavy. The 1/2-28 muzzle threads allow for standard muzzle devices, and the M4 feed ramps at the opposite end interface perfectly with M4 feedramps in your upper receiver. You can have confidence in the Brownells Lightweight Carbine Barrels, backed by our original purchaser lifetime guarantee.