NBS 18" 6mm ARC 4150 Midlength Medium 1:7.5 Twist Nitride Barrel - 6ARCM18MED50B7.5T2
Only 5 left in stock
Elevate your AR-15 build with the precision-engineered 18″ 6mm ARC 4150 Midlength Medium 1:7.5 Twist Nitride Barrel, designed for shooters who demand long-range accuracy without compromising on reliability. Chambered in the innovative 6mm ARC cartridge, this barrel delivers exceptional ballistics, low recoil, and flat trajectories ideal for hunting, target shooting, and competitive precision rifle matches. Crafted from durable 4150 chrome moly vanadium steel and finished with a corrosion-resistant nitride treatment, it ensures consistent performance in harsh conditions while maintaining sub-MOA potential.
Key Features
- Premium Material Construction: Made from 4150 CMV steel for superior strength and heat resistance, perfect for extended firing sessions without loss of accuracy.
- Nitride Finish: Melonite treatment provides enhanced wear resistance, easier cleaning, and protection against rust, extending the barrel’s lifespan in demanding environments.
- Optimized Twist Rate: 1:7.5 twist stabilizes heavier 6mm ARC bullets (80-108 grains), maximizing velocity and wind-bucking performance for shots beyond 800 yards.
- Midlength Gas System: Reduces recoil impulse compared to carbine systems, improving follow-up shots and shooter comfort during high-volume fire.
- Medium Contour Profile: Balances weight for maneuverability with rigidity for sustained accuracy, weighing just 24 ounces for a lightweight yet robust setup.
Technical Specifications
- Barrel Length: 18 inches – strikes the ideal balance between velocity (around 2,600-2,700 fps with standard loads) and overall rifle compactness.
- Caliber: 6mm ARC – Hornady’s versatile cartridge offering match-grade precision in an AR-15 platform.
- Gas Block Journal: 0.750 inches – Compatible with standard low-profile gas blocks for seamless integration.
- Muzzle Threads: 5/8×24 – Readily accepts suppressors, muzzle brakes, and flash hiders to customize your setup.
- Platform: AR-15 – Direct fit for most AR-15 lowers and uppers, simplifying upgrades.
Why Choose This 6mm ARC Barrel?
For enthusiasts frustrated with short-range limitations of traditional 5.56, this barrel addresses key pain points by unlocking the 6mm ARC’s potential for ethical long-distance hunting and precise target engagement. Its medium profile dissipates heat efficiently, preventing accuracy degradation during rapid fire, while the nitride finish minimizes maintenance hassles in the field. Whether you’re competing in PRS-style matches or pursuing game at extended ranges, this barrel delivers reliable, repeatable results that outperform standard AR configurations. Backed by rigorous manufacturing standards, it’s the upgrade that transforms your rifle into a precision instrument.
Ready to experience the future of AR-15 performance? Integrate this high-quality 6mm ARC nitride barrel into your build today and push the boundaries of what’s possible with tactical firearms accessories.
Frequently Asked Questions
Q: What makes the 6mm ARC cartridge suitable for long-range shooting?
A: The 6mm ARC combines high ballistic coefficients with moderate recoil, achieving effective ranges up to 1,000 yards while fitting standard AR-15 magazines for easy handling.
Q: Is a 1:7.5 twist rate versatile for different bullet weights?
A: Yes, it excels with 80-108 grain projectiles common in 6mm ARC loads, providing optimal stabilization for both hunting and match ammo without over-spinning lighter bullets.
Q: How does the midlength gas system benefit my AR-15?
A: It offers smoother cycling and reduced felt recoil compared to shorter systems, enhancing accuracy and comfort, especially when suppressed.
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Through the strong partnerships AR15Discounts has built with trusted suppliers and vendors, we regularly gain access to premium components often manufactured by or for leading industry names. By purchasing these in volume, we bring them to you under the NBS label, ensuring proven quality reaches your build at a fair price, without the added cost of extensive marketing.
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Every NBS product is specified to the exacting standards we apply to our own rifles. Each component features precision CNC machining, American-made key components where it counts, robust materials, dependable steels, and durable finishes engineered for long-term reliability. These items are either sourced from reputable OEMs or carefully assembled in-house using established name-brand elements, maintaining consistent excellence throughout the lineup.
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From stripped and complete uppers to bolt carrier groups, handguards, lower parts kits, and beyond, NBS provides a unified, affordable selection that allows you to complete confident, high-performing builds.
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All NBS products come with our Limited Lifetime Warranty for the original owner, covering defects in materials and workmanship. AR15Discounts stands firmly behind these parts because, as shooters ourselves, we use and trust them, delivering honest value and gear you can rely on.
| 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.
