RTB Nickel Boron Bolt Carrier Group - 158 - MPI - M16 BCG (5.56)

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Product Code: NIBBCG-2
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List Price: $169.99
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Nickel Boron Bolt Carrier Group - 158 - MPI M16 BCG (5.56)

This M16 Bolt Carrier Group drops right into your M16, AR15 or M4 platform rifle. We source our components from manufacturers that meet or exceed Military Specifications. All parts are machined and properly heat treated to Mil-Spec followed by complete Nickel Boron coating with UCT's Exclusive EXO Technology.

Our Nickel Boron Bolt Carrier Group is specifically coated to allow your rifle to operate smoothly, be easily maintained, and work longer without being cleaned. We offer a 100% money back guarantee. With top quality companies that we utilize to plate our BCG's such as the UCT bolt carrier group, and WMD bolt carrier group, we are confident that each component that the BCG is made of will successfully work on any quality AR15 rifle. Every component, from the extractor to the firing pin, is made with exacting specifications to meet military standards and provide the best control possible. The 158 MPI BCG is engineered to fit and work with the AR15, M4, and also as a M16 BCG.

Order from our site today and experience the quality products we have to offer at great prices. If you are not satisfied, take advantage of our 100% money back guarantee. We inspect and test fire every unit before packaging. Some light fouling may be present.


  • Coated Inside & Out With UCT's EXO NiB
  • Milspec Carpenter No. 158® Steel (Bolt)
  • 8620 Tool Steel (Carrier)
  • Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring
  • Tool Steel Extractor
  • Shrouded Firing Pin
  • Mil-Spec Gas Key (4130 Steel) attached with Grade 8 hardware and Properly staked
  • Bolt is shot Peened and MPI
  • Carrier is polished before plating for increased lubricity
  • Limited Lifetime Warranty