Green Mountain 5.56 AR-15 Barrel 18" M4 Passivated - GM-M24-556
$218.95
Out of stock
Enhance the performance and reliability of your AR-15 build with the Green Mountain 5.56 AR-15 Barrel 18″ M4 Passivated. Precision-engineered for tactical and recreational shooters alike, this 18-inch barrel delivers consistent accuracy and smooth operation in a versatile M4 profile design.
Key Features
- 18-inch M4 profile for balanced weight distribution and maneuverability without sacrificing velocity
- Passivated stainless steel finish provides superior corrosion resistance and a durable, low-maintenance surface
- 5.56 NATO chamber ensures compatibility with both 5.56 and .223 Remington ammunition for maximum versatility
- 1:8 twist rate stabilizes a wide range of bullet weights from 55 to 77 grains for optimal accuracy
- Rifle-length gas system promotes reliable cycling and reduced recoil impulse
- 1/2×28 muzzle thread pattern allows easy attachment of suppressors, flash hiders, or compensators
- 0.75-inch gas block journal accommodates standard low-profile or adjustable gas blocks
Benefits for Your Build
This barrel addresses common shooter concerns by combining the proven M4 contour for heat dissipation and strength with a passivated stainless construction that resists rust in demanding environments. The 1:8 twist offers flexibility across ammunition types, helping you achieve tight groups at the range or in the field. Rifle gas system length contributes to smoother operation compared to shorter systems, reducing wear on your upper receiver components.
Specifications
- Platform: AR-15
- Barrel Length: 18 inches
- Profile: M4
- Finish: Stainless (passivated)
- Cartridge Compatibility: 5.56 NATO
- Twist Rate: 1:8
- Gas System: Rifle length
- Gas Block Journal: 0.75 inches
- Muzzle Thread: 1/2×28
- Weight: 34.8 oz
Why Choose This Product
Green Mountain barrels are crafted with attention to detail, making them a trusted choice for custom AR-15 builds where precision and longevity matter. The passivated finish adds an extra layer of protection, ideal for those seeking a stainless option that maintains its appearance over time.
Upgrade your AR-15 with this reliable barrel to experience improved accuracy and dependable function in your next build or upgrade project.
| Weight | 34.8 oz |
|---|---|
| Dimensions | 18 in |
| Finish | Stainless |
| Barrel Profile | M4 |
| Cartridge Compatibility | 5.56 NATO |
| Gas Block Journal | 0.75 |
| Barrel Length | 18 |
| Gas System Length | Rifle |
| Platform | AR-15 |
| Twist Rate | 1:8 |
| Muzzle Thread Pattern | 1/2×28 |
| MPN | GM-M24-556 |
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.
