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The Brownells Retro A2 rifle length barrel is designed to replicate the "Government" profile that is found on the M16A2. This barrel is chambered in 5.56x45 and has a chrome-lined finish with a matte black phosphate finish. It has a 1-7" twist and an overall length of 20". The muzzle thread has a size of ½"-28 tpi, and a standard rifle barrel extension is pre-installed in the back. This barrel has a 5.56 NATO chamber (compatible with .223 Rem) with original 1-7" rifling that is suitable for heavier bullets. It is important to note that this barrel requires a rifle-length gas tube, which is available separately, and it comes with an M16 barrel extension (no M4 feedramps). The front sight base of this barrel is non-F-Marked and measures 0.750 inches, which is compatible with carry handle rear sights. This Brownells Retro A2 rifle barrel is made from ultra-strong 4150 chrome-moly steel and each barrel is magnetic particle inspected when finished to ensure there are no hidden flaws that could shorten its service life. The barrels are engraved with "MFR 12238 MP CHROME BORE 1-7". The assembly includes the following components: M16 Barrel Extension, .750 Non-F-Marked Front Sight Base, A2 Front Sight Post with detent hardware, Triangle Handguard Cap (compatible with A2 and M5 RAS handguards), Delta Ring Assembly, and a Sling Swivel riveted in place. The complete assembly is also available for purchase.