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Brownells offers Government Barrel Assemblies that are chrome lined and inspected individually. These barrel assemblies are made by a US Government Contractor for M4 barrels and meet strict quality standards. The barrels feature button rifling and a hard chrome bore for durability and reliability. Each barrel is subjected to High Pressure Testing and Magnetic Particle Inspection & Gauging to ensure that they meet the standards. The assemblies come pre-installed with a slip ring assembly, F-Marked front sight base and handguard cap. The barrel length determines the appropriate handguard cap, with a round cap for M4 Carbine assemblies and the proper triangle for rifle length. The barrel material is 4150 chrome moly steel with a 5.56x45mm chamber and a 1-7 twist, which ensures optimal performance with 62 grain and larger bullets. All barrels are marked as “5.56x45mm NATO MFR 12238 MP HP 1-7”.