Bear Creek Arsenal .458 SOCOM / .450 Bushmaster AR-15 Bolt Carrier Group – Nitride

SKU: BCG-450-458

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Bear Creek Arsenal .458 SOCOM / .450 Bushmaster AR-15 Bolt Carrier Group – Nitride

For your next big-bore AR15 build, the Bear Creek Arsenal .458 SOCOM / .450 Bushmaster Bolt Carrier Group is an excellent choice. This bolt carrier group is designed to withstand heavy use and provide reliable performance. With big calibers, comes big responsibility, being made with high-quality materials and with a nitride finish that helps to protect against wear and corrosion to ensure reliable function.

The bolt carrier group is made of 9310 steel, a durable material that is commonly used in firearms manufacturing. This material is known for its strength and resistance to wear and tear, which makes it an excellent choice for a long-lasting bolt carrier group. The gas key on the bolt carrier group is staked. This means that it is securely attached to the bolt carrier, which helps to prevent gas leaks and ensure reliable operation.

The bolt carrier group features a black nitride finish on the carrier. This finish provides excellent corrosion resistance, as well as a sleek, matte black appearance. The bolt on the bolt carrier group has a parkerized finish. This finish helps to protect the bolt from wear and tear, as well as corrosion. BCA’s bolt carrier groups are MPI inspected, which means that each unit is individually tested for flaws and defects. This ensures that you receive a high-quality product that is free from defects and ready to use.

BCA’s bolt carrier group is an excellent choice for your next .450 Bushmaster or .458 SOCOM AR-15 build. With its quality materials, reliable components, and thorough inspection process, you can trust that this bolt carrier group will provide reliable performance and long-lasting durability.


  • Bolt
  • Bolt Carrier
  • Extractor pin
  • Firing pin
  • Cam pin


  • Brand: Bear Creek Arsenal
  • Model: .458 SOCOM / .450 Bushmaster AR-15 Bolt Carrier Group – Nitride
  • MPN: BCG-450-458
  • Caliber: .458 SOCOM and .450 Bushmaster
  • Fit: AR-15
  • Bolt Finish: Parkerized
  • Bolt Material: 9310 Steel
  • Carrier Finish: Black Nitride
  • Gas Key: Staked
  • Magnetic Particle Inspection: Yes
  • Weight: 0.71

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

How do I take advantage of the Bear Den Guarantee?

No registration for your Bear Creek Arsenal product is required. If you believe repair work or service is required for your BCA-purchased product (directly from BCA or from AT3), please submit an RMA request from BCA’s website directly. Here is a how-to video on the procedure to submit an RMA.

If you require additional help processing your warranty, please reach out to BCA’s customer service desk at and they can help guide you further.

Remove all accessories/attachments before returning item. Extra fees may be charged if accessories are not removed.

For more details on the Bear Den Guarantee, please review BCA’s terms & conditions page.

What is the Limited Lifetime warranty aka Bear Den Guarantee designed to cover?

This Bear Den Guarantee is designed to cover any possible manufacturing defects and issues caused by assembly.

What voids my Bear Den Guarantee?

  • Cutting, modifying, or misuse of a BCA product
  • Having another manufacturer or gunsmith work on a BCA product
  • Damage caused by using high velocity or high-pressure ammunition, tracer ammunition, or hand-loaded ammunition
  • Normal wear and tear

Once BCA receives my warranty return, what can I expect?

Please allow BCA’s warranty team 1-14 business days after your product arrives at the manufacturing facility to assess and replace. Once assesed, BCA will email you what was done to it and provide tracking for the return of your product.

I painted my BCA product, what happens if I need to send it in for repair?

The product you will receive back will be repaired but BCA cannot ensure that your customizations will be able to be maintained. For example, if your barrel is cerakoted from an outside source and BCA needs to polish the feedramps, it would be sent back as is after repair.

Terms and Limitations

BCA reserves the right to reject any returned product and to decline to issue any reimbursement if in our sole judgment the returned product has been damaged by you or otherwise while in your custody or care.

BCA reserves the right to repair, replace, or issue credit for the returned product regardless of the requested outcome.

No return payment will issue to you until BCA has received, processed, and accepted your returned product, packaging, proof of purchase, and return tag.

Typical processing time is 1-14 business days from the date BCA receives your return.

Check out the rest of BCA’s FAQ on Returns and Warranties HERE