Green Mountain 5.56 AR-15 Barrel 16" M4 Phosphate - GM-M4
$182.95
Only 4 left in stock
Elevate your AR-15 build with the Green Mountain 5.56 AR-15 Barrel 16″ M4 Phosphate. Engineered for precision shooters and tactical enthusiasts, this carbine-length barrel delivers reliable performance in a versatile 16-inch configuration.
Key Features and Benefits
- Chrome-lined bore and chamber – Provides superior corrosion resistance and extends barrel life, making cleaning easier after high-volume shooting sessions.
- Phosphate finish – Offers a durable, non-reflective exterior that withstands harsh conditions while reducing glare during use.
- M4 profile design – Balances weight and strength for improved handling and maneuverability without sacrificing rigidity.
- 1:9 twist rate – Optimizes bullet stabilization for a wide range of 5.56 NATO and .223 Remington loads, enhancing accuracy across common ammunition types.
- Carbine-length gas system with 0.75″ journal – Ensures smooth, reliable cycling in standard AR-15 platforms.
Technical Specifications
- Barrel Length: 16 inches
- Platform: AR-15
- Cartridge Compatibility: 5.56 NATO
- Twist Rate: 1:9
- Muzzle Thread Pattern: 1/2×28
- Gas System: Carbine
- Gas Block Journal: 0.75 inches
- Finish: Phosphate with chrome-lined bore and chamber
- Barrel Profile: M4
- Weight: 31.2 oz
Why Choose This Green Mountain Barrel
Built to mil-spec standards from quality 4150-series steel, this barrel addresses common AR-15 pain points like premature wear and inconsistent feeding. The combination of chrome lining and phosphate coating ensures longevity and low maintenance, while the threaded muzzle allows easy attachment of compensators, flash hiders, or suppressors. Ideal for home defense setups, range use, or custom builds seeking dependable performance.
Upgrade your rifle’s accuracy and durability with this proven component from a trusted manufacturer.
| Weight | 31.2 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 | 1:9 |
| Muzzle Thread Pattern | 1/2×28 |
| MPN | GM-M4 |
| UPC | 33758 |
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.
