18" 6mm ARC 4150 Midlength Medium 1:7.5 Twist Nitride Barrel - 6ARCM18MED50B7.5T2
In stock
18″ 6mm ARC 4150 Midlength Medium 1:7.5 Twist Nitride Barrel
Precision-engineered for long-range performance in AR-15 platforms.
The 18″ 6mm ARC Midlength Barrel delivers long-range capability in a durable and efficient package. Crafted from 4150 Chrome Moly Vanadium steel and finished in black nitride, this barrel is built for superior strength, corrosion resistance, and smooth cycling under extended use. Optimized with a 1:7.5 twist rate, it stabilizes high-BC projectiles for exceptional accuracy at distance.
The medium contour offers the right balance of stiffness and weight, while the midlength gas system ensures reliable performance and reduced recoil impulse. Ideal for precision builds, hunting, or extended-range shooting, this barrel lets you unlock the full ballistic potential of the 6mm ARC cartridge in the AR-15 platform.
Features
- 4150 CrMoV Steel Construction – Built for high heat and extended durability
- Black Nitride Finish – Enhances barrel life and corrosion resistance
- 1:7.5 Twist Rate – Optimized for stabilizing long, high-BC bullets
- Midlength Gas System – Promotes smoother recoil and reliable cycling
- Medium Profile – Balanced for accuracy and weight savings
- Threaded 5/8×24 Muzzle – Ready for suppressors or muzzle devices
Specifications
- Caliber: 6mm ARC
- Barrel Length: 18″
- Twist Rate: 1:7.5 RH
- Gas System: Midlength
- Muzzle Thread: 5/8×24
- Gas Block Journal: 0.750″
- Finish: Black Nitride (Melonite/QPQ)
- Profile: Medium
- Platform: AR-15
- Origin: Made in the USA
| Weight | 24 oz |
|---|---|
| Dimensions | 20 × 3 × 3 in |
| Finish | Nitride / Melonite |
| Barrel Profile | Medium |
| Cartridge Compatibility | 6mm ARC |
| Gas Block Journal | 0.75 |
| Barrel Length | 18 |
| Gas System Length | Midlength |
| Platform | AR-15 |
| Twist Rate | 1:7.5 |
| Muzzle Thread Pattern | 5/8×24 |
| MPN | 6ARCM18MED50B7.5T2 |
| UPC | 28363 |
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.
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