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Bolt Carrier Groups – AR-15, AR-10 & 9mm BCGs | Nickel Boron & Full Auto


Bolt Carrier Groups – AR-15, AR-10 & 9mm BCGs | Nickel Boron & Full Auto

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Bolt Carrier Groups – AR-15, AR-10, & 9mm BCGs for Every Build

Precision Bolt Carrier Groups for AR Platforms of All Calibers

Looking for a reliable, battle-ready bolt carrier group (BCG) for your next AR build? Whether you're upgrading your AR-15, building out an AR-10, or dialing in a 9mm PCC, Mounts Plus has the right BCG to match your needs.

We carry mil-spec, Nickel Boron, Nitride, and Phosphate-finished BCGs from top-tier brands like Fail Zero, Aero Precision, BCM, Spike’s Tactical, and Sons of Liberty Gun Works — all trusted by competitive shooters, duty officers, and everyday gun owners alike.


🧰 What Is a BCG and Why Does It Matter?

The Bolt Carrier Group is the heart of your AR-15 or AR-10. It's responsible for:

  • Cycling rounds and extracting spent casings
  • Striking the firing pin with proper force
  • Maintaining consistent chamber pressure

A poor-quality BCG means misfires, jams, and poor reliability.


🔧 Types of Bolt Carrier Groups We Offer

Standard AR-15 BCGs (5.56/.223/300 BLK)

  • Full-auto rated (M16 profile)
  • MPI-tested bolts
  • Compatible with all mil-spec AR-15 receivers

AR-10 / .308 BCGs (DPMS / SR-25)

  • .308 & 6.5 Creedmoor compatible

  • Available in NiB and Nitride finishes

9mm BCGs (Glock & Colt Compatible)

  • Designed for blowback operation
  • LRBHO support (where applicable)
  • Works with PCC lowers and 9mm AR uppers

Lightweight & Competition BCGs

  • TiN and DLC-coated options
  • Reduced mass for faster cycling and competition shooting

🛡️ BCG Finish Options: What’s the Difference?

Finish Lubrication Cleanability Wear Resistance Ideal For
Nickel Boron (EXO) Self-lubricating Easiest Excellent Suppressed, dirty ammo
Black Nitride Needs oil Easy Great General use
Phosphate Needs oil Harder to clean Good Budget builds or mil-spec purists

🔍 Top Brands We Trust

  • Fail Zero – Premium EXO-coated Nickel Boron BCGs
  • BCM – Mil-spec phosphate M16 carriers
  • Sons of Liberty Gun Works (SOLGW) – Battle-tested BCGs
  • Aero Precision – Nitride-finished AR-15 and AR-10 BCGs
  • Spike’s Tactical – Phosphate and lightweight carrier options
  • CMC Triggers – Enhanced AR-15 BCGs for smooth function
  • Phase 5, Angstadt Arms, and more...

🧠 BCG Fitment & Compatibility

All BCGs sold by Mounts Plus are:

  • 🔧 Drop-in ready for standard AR upper receivers

  • 🧱 Compatible with carbine, mid-length, and rifle gas systems

  • ✅ Available in Type I and Type II bolt face variants

  • 💥 Suitable for standard, suppressed, or competition rifles

Need a BCG for 6.5 Grendel, 7.62x39, 6mm ARC, or 458 SOCOM? We carry those too.


🔥 Best-Selling Bolt Carrier Groups

  • Fail Zero AR-15 BCG – Nickel Boron
  • Spike’s Tactical M16 BCG – Black Phosphate
  • Sons of Liberty BCG – Full Auto Rated, Nitride Finish
  • Angstadt Arms 9mm BCG – Glock-Compatible

Frequently Asked Questions About Bolt Carrier Groups

Q: Do I need a full-auto BCG for my AR-15?
Yes. Full-auto carriers (M16 profile) are legal and provide extra mass for smoother cycling and reliability.

Q: Is Nickel Boron better than Nitride?
Nickel Boron is self-lubricating and easier to clean, especially in suppressed or high-round-count rifles. Nitride is a great, cost-effective alternative.

Q: Can I use an AR-10 BCG in my AR-15?
No. AR-10 and AR-15 BCGs are not interchangeable due to size and platform differences.

Q: What is MPI testing?
Magnetic Particle Inspection (MPI) detects micro-cracks in the steel, ensuring long-term durability.

Q: Are your BCGs made in the USA?
Yes. We stock U.S.-manufactured BCGs from trusted American brands.


🛒 Shop Bolt Carrier Groups Now

Upgrade your rifle with a BCG you can trust. From precision AR-15s to hard-use duty rifles and competition PCCs, Mounts Plus has the perfect bolt carrier group for every platform.