Carbine-length barrels machined from high-grade 4140 carbon steel come with gas port pre-drilled, barrel extension with M4-style feed ramps, and ½"-28 tpi muzzle threads to accept a wide range of flash hiders and muzzle brakes. Chambered for 5.56mm NATO, with 1-9" rifling. Standard model replicates the dimensions of the original, mil-spec M4 barrel, perfect for a lightweight, fast-handling tactical carbine. Heavy model is .115" thicker under the handguard for extra rigidity to resist accuracy loss caused by barrel overheating during sustained fire; identical to the Standard model forward of the gas port. Target model is .210" thicker under the handguard than the Standard barrel for even greater resistance to heat-induced distortion. All models have a hard, MIL-DTL-13924-D black oxide finish that adds surface strength and corrosion resistance.
SPECS:
4140 chrome-moly steel, matte black oxide finish. 16½" long, .750" O.D. at gas port, .700" O.D. at muzzle. Chambered for 5.56mm NATO. 1-9" twist. Not chrome lined. Standard - .665" O.D. under handguard. 28 oz. (794g) weight. Heavy - .780" O.D. under handguard. 32 oz. (907g) weight. Target - .875" O.D. under handguard.
Catalog page 16