CMMG Barrel Sub-Assm 18.0inch HT 416SS 308 Win

The CMMG Barrel Sub-Assembly 18.0-inch Heavy Taper 416 Stainless Steel 308 Winchester is a complete, ready-to-install barrel component engineered for custom rifle builds and upper receiver assemblies. Manufactured with factory-installed barrel extension and pre-headspaced to specification, this sub-assembly eliminates the need for separate headspacing verification—a critical advantage when assembling precision rifle platforms that demand sub-minute-of-angle accuracy and reliable feeding across duty cycles.

Built from 416 stainless steel with a bead-blasted finish, the barrel resists corrosion and provides superior heat dissipation during sustained fire. The 18-inch length balances velocity retention with maneuverability—optimal for intermediate-range precision work without excessive muzzle length. A 1:10 twist rate stabilizes standard to premium 308 Winchester projectiles from 155 to 190 grains. The rifle-length gas port and .936-inch gas journal deliver proper dwell time for reliable bolt cycling. Threaded 5/8-24 muzzle accommodates common suppressors, flash hiders, and muzzle devices, enabling customization for sound signature management or recoil reduction.

This barrel sub-assembly serves AR-10 and precision rifle platform builders requiring a verified, combat-proven component for law enforcement, military training, or competitive long-range applications. The heavy taper profile increases rigidity while maintaining a professional appearance, reducing point-of-impact shift during rapid firing sequences. Weighing 3.7 lbs, the assembly integrates seamlessly into modern modular rifle systems without compromising balance or handling characteristics.

CMMG's reputation for precision manufacturing and QC standards ensures dimensional accuracy and consistent chamber tolerances. Pre-headspaced barrels eliminate guesswork during assembly, reducing field failures and ensuring immediate reliability. For builders prioritizing verified performance over individual component sourcing, this barrel sub-assembly delivers confidence at the cartridge level.