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The Retro A1 rifle-length barrel from Brownells mimics the exact exterior structure of the original skinny M16A1 rifle barrel. This makes it perfect for Retro Rifle™ building or any lightweight AR-15 assembly. This chrome-lined barrel is chambered in 5.56x45 and has a 1-12" twist with a matte black phosphate finish. It is 20" long and features ½"-28 tpi muzzle threads, with a standard rifle barrel extension already pre-installed. It can accommodate both 5.56 NATO and .223 Rem cartridges and is compatible with heavier bullets due to its original 1-12" rifling. A rifle-length gas tube is required, which is sold separately. The barrel is available both as a stripped or complete assembly and is machined from 4150 chrome-moly steel for maximum durability. It has been subjected to magnetic particle inspection to ensure its longevity.