Green Mountain 5.56 AR-15 Barrel 14.5" M4 Phosphate - GM-M19
$194.95
Out of stock
Upgrade your AR-15 build with the precision-engineered Green Mountain 5.56 AR-15 Barrel. This 14.5-inch M4 profile barrel delivers reliable performance for tactical, competition, and home defense applications. Crafted for shooters who demand accuracy and durability, it features a chrome-lined bore and phosphate finish for superior corrosion resistance and extended service life.
Key Features and Benefits
- Chrome-lined bore and phosphate finish – Provides exceptional resistance to wear, heat, and corrosion while maintaining tight tolerances for consistent accuracy shot after shot.
- M4 barrel profile with carbine-length gas system – Balances lightweight handling with the strength needed for sustained fire, reducing felt recoil and improving maneuverability in dynamic scenarios.
- 1:7 twist rate – Optimizes stabilization for a wide range of 5.56 NATO and .223 Remington loads, including heavier bullets commonly used in precision and defensive applications.
- 0.75-inch gas block journal and 1/2×28 muzzle threads – Offers broad compatibility with standard gas blocks, muzzle devices, and suppressors for easy customization.
Technical Specifications
- Platform: AR-15
- Cartridge: 5.56 NATO
- Barrel Length: 14.5 inches
- Profile: M4
- Gas System: Carbine
- Twist Rate: 1:7
- Finish: Phosphate with chrome lining
- Gas Block Journal: 0.75 inches
- Muzzle Thread: 1/2×28
- Weight: 29.4 ounces
Why Choose This Green Mountain Barrel
Green Mountain barrels are trusted by serious shooters for their consistent quality and performance. The 14.5-inch length provides an ideal balance of velocity and handling while the M4 contour reduces unnecessary weight without sacrificing rigidity. Whether you’re building a new rifle or upgrading an existing platform, this barrel addresses common pain points like premature wear, inconsistent accuracy, and limited accessory options.
Engineered to exacting standards, it ensures reliable feeding and extraction across various ammunition types. The chrome lining enhances longevity under high-round-count use, making it a smart investment for enthusiasts and professionals alike.
Installation and Compatibility Notes
This barrel is designed for standard AR-15 upper receivers and pairs perfectly with carbine-length gas tubes. Professional gunsmith installation is recommended to ensure proper headspacing and alignment.
| Weight | 29.4 oz |
|---|---|
| Dimensions | 14.5 in |
| Finish | Phosphate + Chrome Lined |
| Barrel Profile | M4 |
| Cartridge Compatibility | 5.56 NATO |
| Gas Block Journal | 0.75 |
| Barrel Length | 14.5" |
| Gas System Length | Carbine |
| Platform | AR-15 |
| Twist Rate | 1:7 |
| Muzzle Thread Pattern | 1/2×28 |
| MPN | GM-M19 |
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.
