Cmmg Barrel 16.1" 350 Legend Sbn

The CMMG Barrel 16.1" 350 Legend Sbn is a complete drop-in barrel assembly engineered for precision rifle builds and upper receiver customization. This finished barrel comes pre-assembled with a properly installed M4 barrel extension and carbine-length gas port, eliminating the need for additional headspacing work and accelerating your build timeline.

Manufactured from 4140 Chrome Moly steel with a durable SBN finish, this 16.1-inch barrel delivers the ballistic performance the 350 Legend cartridge requires while maintaining an efficient package for mid-range engagements and hunting applications. The 1:16 twist rate stabilizes standard 350 Legend projectiles across the commercial spectrum, and the carbine-length gas port with 0.750" gas block journal ensures reliable cycling with adjustable gas blocks for tuning suppressed or unsuppressed configurations. The 1/2x28 thread pitch accommodates standard muzzle devices, while the medium taper profile balances weight reduction with structural rigidity—a practical choice for both patrol-weight uppers and precision platforms.

This barrel suits builders assembling custom Mk4 upper groups, hunters transitioning to intermediate cartridges, and operators evaluating the 350 Legend for reduced recoil and compact handling. Field-proven on accuracy nodes and duty cycles, CMMG barrels are recognized for consistent bore quality and proper chamber tolerances. All sub-assemblies arrive head-spaced and ready to function, reducing guesswork during assembly and enabling faster transition to the range or field.

Whether you're building a DMR-pattern upper, a lightweight hunting platform, or a suppressed duty carbine, this 16.1-inch 350 Legend barrel from CMMG delivers the foundation for a reliable, shooter-focused system. The pre-installed extension and verified headspace eliminate common assembly friction points, letting you focus on upper receiver fit and gas system optimization.