Enhance the performance and reliability of your AR-15 build with the Green Mountain 5.56 AR-15 Barrel 14.5″ M4 Phosphate. Precision-engineered for tactical and recreational shooters, this barrel delivers consistent accuracy and dependable function in a compact package ideal for carbine-length configurations.
Key Features and Benefits
- Chrome-Lined Bore and Chamber: Provides exceptional resistance to wear and corrosion while simplifying maintenance, ensuring long-term durability even under high-round-count use.
- M4 Profile Construction: Offers an optimal balance of strength and reduced weight for improved handling and maneuverability without sacrificing rigidity.
- 1:7 Twist Rate: Stabilizes a wide range of bullet weights, including heavier 62-77 grain projectiles, for superior accuracy across various loads.
- Carbine-Length Gas System: Promotes reliable cycling and smooth operation in shorter barrel setups, minimizing recoil and enhancing overall shootability.
- Phosphate Finish: Delivers robust protection against environmental elements while maintaining a low-profile, non-reflective appearance suitable for tactical applications.
Technical Specifications
- Barrel Length: 14.5 inches
- Cartridge Compatibility: 5.56 NATO / .223 Remington
- Platform: AR-15
- Gas Block Journal: 0.75 inches
- Muzzle Thread Pattern: 1/2×28
- Finish: Phosphate with Chrome Lining
- Approximate Weight: 29.4 ounces
Why Choose This Barrel for Your Build?
This Green Mountain barrel addresses common pain points in AR-15 customization, such as finding a reliable short-barrel option that maintains gas system efficiency and accuracy. Its chrome-lined interior extends service life and resists fouling, while the M4 contour supports versatile optics and accessory mounting. Whether assembling a home-defense rifle or a range-ready carbine, it provides the foundation for a high-performing upper assembly.
Built to exacting standards from quality 4150-series steel, this component ensures compatibility with standard AR-15 components for straightforward installation and dependable results.


