CMMG AR-15 Barrel 16.1" 350 Legend SBN Finish
CMMG
$201.69
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CMMG
CMMG AR-15 Barrel 16.1" 350 Legend SBN Finish
The CMMG 16.1" 350 Legend Barrel in SBN finish is a precision-engineered drop-in solution for builders looking to complete or upgrade a custom Mk4 upper group with one of today's most versatile straight-wall rifle cartridges.
- Built from durable 4140 Chrome Moly steel for long-lasting performance
- Salt Bath Nitride (SBN) finish provides superior corrosion and wear resistance
- 1:16 twist rate optimized for 350 Legend projectile stability and accuracy
- Carbine-length gas system tuned for reliable cycling with 350 Legend loads
- Pre-installed M4 barrel extension, properly headspaced and ready to build
- Medium taper profile balances weight savings with overall barrel rigidity
Who This Is For
This barrel is ideal for AR-15 platform builders, hunters, and sport shooters who want to run 350 Legend — a cartridge celebrated for its hard-hitting performance on deer-sized game and its compliance with straight-wall cartridge hunting regulations in many states. Whether you're assembling a dedicated hunting rifle or a versatile range build, this CMMG barrel delivers the reliability and fit you'd expect from a top-tier manufacturer without requiring gunsmith headspacing work.
Specifications
| Brand | CMMG |
|---|---|
| Caliber | 350 Legend |
| Barrel Length | 16.1 inches |
| Material | 4140 Chrome Moly Steel |
| Finish | Salt Bath Nitride (SBN) |
| Twist Rate | 1:16 |
| Thread Pitch | 1/2×28 |
| Gas System | Carbine Length |
| Gas Block Journal | .750 inches |
| Profile | Medium Taper |
| Barrel Extension | M4 (Pre-Installed) |
| Compatible Platform | AR-15 / Mk4 Upper |
Frequently Asked Questions
Will this barrel fit a standard AR-15 lower receiver and upper?
Yes. This CMMG barrel is designed to work with standard AR-15 platform components. It comes with a pre-installed M4 barrel extension and is properly headspaced, making it compatible with Mil-Spec AR-15 upper receivers. You will need a .750" low-profile gas block (not included) to complete the gas system assembly.
What kind of ammunition performs best with a 1:16 twist rate in 350 Legend?
The 1:16 twist rate is specifically optimized for 350 Legend bullets, which typically range from 145 to 180 grains. This twist rate provides excellent stabilization across the most common factory hunting and range loads, including Winchester, Federal, and Hornady offerings. Heavier bullets above 200 grains may perform better in a faster twist, but standard 350 Legend loads will cycle and group reliably.
Do I need any special tools or gunsmithing to install this barrel?
Because this barrel ships with the M4 extension already installed and properly headspaced, no headspacing tools or gunsmith work is required. Standard AR-15 armorer's tools — including an upper vise block, barrel nut wrench, and torque wrench — are sufficient for a complete installation. Adding a gas block and handguard will complete the upper assembly.
