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Mil-spec and full-auto BCGs, forged and coated for ultimate reliability.

A quality bolt carrier group drives the reliability in your upper receiver, literally: It's responsible for chambering and ejecting rounds, and managing your direct-impingement gas system to ensure your AR cycles reliably. We've worked carefully to source quality, mil-spec, Full Auto-profile BCGs that are made to interface with the most popular AR calibers and platforms!

Heavy-duty BCGs for extreme duty, high heat, and rapid fire

Our relatively small selection of bolt carriers is purposeful: You only one solid option, and that's a proper M16-type BCG with the best specs:

  • Chrome lined carrier
  • Chrome lined gas key
  • Hardened gas key
  • Properly staked
  • S7 Tool Steel extractor (correctly heat-treated)
  • Bolt forged from Carpenter No. 158 Steel
  • 9310 carrier body (superior to mil-spec 8620)

Sporting incredibly high tensile and yield strengths, these bolt carrier groups are capable of handling high-pressure rounds like 6.5 Creedmoor and 6.5 Grendel, while affording superior heat and wear resistance during rapid fire. They're properly hardened and coated to ensure they remain resistant to corrosion and fouling for years to come and tens of thousands of rounds down the tube.

Bolt Carrier Group Compatibility

With so many calibers and uppers available, it can be tough picking out the right components for your AR-type rifle or pistol. Rest assured the bolt carrier groups available here are made to work with all the popular calibers currently available:

  • 5.56 NATO
  • .223 Rem
  • .224 Valkyrie
  • .243 Winchester
  • 6.5 Grendel
  • 300 Blackout
  • .308 Winchester
  • 6.5 Creedmoor

"What about your 9mm build kits and bolts?"

The available 9mm AR kits and parts we list are designed to work with the popular (but proprietary) PSA-designed G9 Hybrid BCG. This bolt carrier group is designed to operate with blowback functionality, ditching the traditional direct-impingement or piston-driven AR gas system. These bolts are included with our available AR-9 build kits and upper assemblies


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At AR-15LowerReceivers.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.