Nickel Boron Bolt Carrier Group


9310 tool steel mil-spec NiB BCG with lifetime warranty

This Nickel Boron Bolt Carrier Group for your AR15, M16, or M4 comes fully assembled. Our bolt carrier group is the best on the market.

  • 5.56/.223
  • Nickel Boron
  • 9310 Steel Bolt
  • MPI Bolt (Magnetic Particle Inspected)
  • Shot Peened Bolt
  • Mil-spec Dry film Lube on Cam Pin
  • Grade 8 Hardened Fasteners
  • Key Staked per Mil-Spec
  • Black Extractor Insert
  • Crane O-Ring
  • Milled Stainless Firing Pin
  • Lifetime Warranty
SKU: nibtrinbcg Category:

In Stock

When a product is listed as being “In Stock”, it is either in our store’s physical inventory or it is at one of our stocking warehouses. Please call us first to check if an item is at our brick and mortar store. Due to high volume of sales, our inventory changes rapidly.

Items coming from warehouse B or D usually take 1 to 3 business days to ship. You can choose to have it delivered to your address or have it sent to the store in Lake Worth. For In-Store pick-up, our professional staff will contact you when your purchase is ready. Our shipping is prompt and our customer support is courteous. Please call us with any questions.

Many of our pictures are stock photos provided by Manufacturers and sometimes have cosmetic differences from the item being purchased. Check description before placing your order.


Firearms and ammunition are non-returnable. Ammo is shipped via Hazmat ground and must be signed for upon delivery.

Trinity Ordnance cannot ship to AK, HI, to any addresses outside of the continental USA, to any US Territories, nor to APO or FPO addresses. Ammo cannot be shipped to a PO Box.