Green Mountain 5.56 AR-15 Barrel 16" M4 Phosphate - GM-M5
$182.95
Out of stock
Upgrade your AR-15 build with the Green Mountain 5.56 AR-15 Barrel 16″ M4 Phosphate, a precision-engineered component designed for reliability and accuracy in tactical and recreational shooting. This carbine-length barrel delivers consistent performance thanks to its robust construction and thoughtful features tailored for 5.56 NATO platforms.
Key Features
- Chrome-lined bore and chamber for enhanced durability and easy cleaning, resisting wear from high-volume shooting
- M4 profile with carbine gas system for balanced weight distribution and reliable cycling
- 1:7 twist rate optimized for stabilizing a wide range of bullet weights, including heavier 62-77 grain projectiles
- Phosphate finish provides excellent corrosion resistance while maintaining a low-profile appearance
- 0.75″ gas block journal and 1/2×28 muzzle threads for broad compatibility with standard accessories
Specifications
- Barrel Length: 16 inches
- Platform: AR-15
- Cartridge: 5.56 NATO
- Twist Rate: 1:7
- Gas System: Carbine
- Finish: Phosphate with chrome-lined bore
- Weight: 31.8 oz
Why Choose This Barrel
Shooters seeking a dependable 5.56 AR-15 barrel benefit from Green Mountain’s reputation for quality manufacturing using premium 4150 chrome moly vanadium steel. The M4 contour offers a proven balance of strength and reduced weight, making it ideal for builds where maneuverability matters without sacrificing rigidity. Whether for home defense, range sessions, or competitive use, this barrel supports accurate shot placement and smooth operation across various ammunition types.
Its chrome lining extends service life by protecting against fouling and erosion, while the phosphate exterior finish guards against environmental factors. The 1:7 twist ensures versatility, allowing effective use of both standard and match-grade loads.
Benefits for Your Build
- Improves overall rifle handling with optimized profile and length
- Enhances longevity through advanced lining and finish technologies
- Supports reliable feeding and extraction in semi-automatic platforms
- Facilitates customization with standard threading and journal dimensions
Invest in a barrel that prioritizes performance and longevity for your next AR-15 project.
| Weight | 31.8 oz |
|---|---|
| Dimensions | 16 in |
| Finish | Phosphate + Chrome Lined |
| Barrel Profile | M4 |
| Cartridge Compatibility | 5.56 NATO |
| Gas Block Journal | 0.75 |
| Barrel Length | 16" |
| Gas System Length | Carbine |
| Platform | AR-15 |
| Twist Rate | 1:7 |
| Muzzle Thread Pattern | 1/2×28 |
| MPN | GM-M5 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
