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Brownells Government Barrel Assemblies are chrome lined and individually inspected to meet the exacting standards. These M4 barrel assemblies are manufactured by a US Government Contractor and feature a hard chrome bore applied over button rifling. Each barrel undergoes High Pressure Testing followed by Magnetic Particle Inspection & Gauging to ensure zero imperfections. The assemblies are ready-to-install with pre-installed slip ring assembly, F-Marked front sight base, and handguard cap. The barrel material is made of 4150 chrome moly steel with an appropriate handguard cap for the barrel length, such as a round cap for M4 Carbine assemblies and a proper triangle for the rifle length. They also have a 5.56x45mm chamber and a 1-7 twist for desired performance with bullets weighing 62 grains and greater. All barrels are marked with "5.56x45mm NATO MFR 12238 MP HP 1-7".