The 6mm ARC bolt carrier group (BCG) is the heart of any AR-15 chambered in 6mm Advanced Rifle Cartridge. Designed for long-range accuracy and superior ballistics, the 6mm ARC demands a purpose-built, Type II BCG that can handle the cartridge’s unique pressure and case dimensions.

At Mounts Plus, we stock Nickel Boron and Black Nitride 6mm ARC BCGs from trusted names like Fail Zero and Santan Tactical. Whether you’re building a precision rifle, a hunting setup, or a suppressed AR-15, our Grendel-compatible BCGs ensure flawless cycling and reliability.

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⚙️ Why a Dedicated 6mm ARC BCG Matters

The 6mm ARC round requires a Type II bolt face—standard 5.56 BCGs won’t cut it. Using the wrong carrier risks misfeeds, poor extraction, and unsafe headspacing. Our BCGs are specifically engineered for:

• Correct Type II bolt face geometry

• 9310 steel bolts and 8620 steel carriers

• MPI-tested, shot-peened construction

• Drop-in AR-15 compatibility

This means better cycling, smoother operation, and a reliable rifle you can count on for every shot.

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🛠️ Finish Options: Nickel Boron vs Black Nitride

Feature	Nickel Boron (NiB)	Black Nitride
Smoothness	Ultra-slick, reduces friction	Smoother than phosphate
Ease of Cleaning	Carbon wipes right off	Cleans with light scrubbing
Durability	Excellent wear resistance	Excellent corrosion resistance
Appearance	Bright silver finish	Matte black tactical look
Best For	Suppressed rifles, high-volume shooting	General use, hunting, cost-effective builds

Both finishes deliver durability and performance—your choice comes down to cleaning preference, aesthetics, and budget.

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🔧 Top 6mm ARC BCG Options

• ✅ Fail Zero EXO Nickel Boron 6mm ARC BCG – Enhanced lubricity, long-lasting finish

• ✅ Santan Tactical Black Nitride 6mm ARC BCG – Precision machining, corrosion resistance

• ✅ Enhanced AR-15 6mm ARC Type II BCGs – Built for competitive and long-range setups

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🎯 Perfect For

• AR-15 rifles chambered in 6mm ARC / .264 LBC

• Long-range precision builds (DMR or competition rifles)

• Hunters targeting medium game like deer or hogs

• Suppressed platforms for cleaner operation

• Builders upgrading from mismatched or worn BCGs

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❓ FAQ:

Why does 6mm ARC need a special BCG?

Because of its larger case head and higher chamber pressure, 6mm ARC requires a Type II bolt face. This ensures proper headspacing and reliable cycling in AR-15 platforms.

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Will a 6mm ARC BCG work in my AR-15?

Yes—as long as your upper is chambered in 6mm ARC. The BCG is drop-in compatible with standard AR-15 receivers.

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Which finish is better: Nickel Boron or Black Nitride?

Nickel Boron offers smoother cycling and easier cleaning, while Black Nitride is rugged, corrosion-resistant, and more budget-friendly. Both are excellent choices.

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Are these BCGs full-auto rated?

Yes. Most carriers are M16-profile full auto rated, which adds durability and mass for smoother cycling while remaining 100% legal in AR-15 builds.

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What comes with a 6mm ARC BCG?

Each unit includes the bolt, carrier, cam pin, firing pin, and retaining pin—fully assembled and ready to drop in.

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🚀 Upgrade Your AR-15 With a 6mm ARC BCG

Don’t bottleneck your rifle with the wrong carrier. Equip your AR-15 with a 6mm ARC Type II BCG and get the accuracy, reliability, and smooth performance this cartridge was built for.

Shop now—fast shipping, top brands, proven performance.

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