AB Arms Mil-Spec AR-15 Nickel Boron Coated Bolt & M-16 Bolt Carrier

Published on December 2, 2013
Duration: 9:43

This video reviews the AB Arms Nickel Boron coated bolt and M16 bolt carrier group for AR-15 platforms. The presenter highlights the benefits of nickel boron coating, including self-lubrication, foul resistance, and reduced wear, particularly on the bolt itself. Key technical specifications and materials are discussed, emphasizing the US manufacturing and veteran ownership of AB Arms.

Quick Summary

Nickel boron coating on AR-15 bolt carrier groups offers self-lubricating properties, reducing the need for frequent oiling and improving foul resistance by preventing carbon from sticking. The bolt itself is the primary moving part experiencing the most wear, making its material and coating critical for longevity and reliability.

Chapters

  1. 00:00Introduction: AB Arms Boron Coated Bolt & Carrier
  2. 00:37Benefits of Nickel Boron Coating
  3. 01:00Importance of the Bolt vs. Carrier
  4. 01:14AB Arms Nickel Boron Bolt Overview
  5. 01:44AB Arms Design Changes & Rationale
  6. 02:04Considerations for AR Parts: Origin & Quality
  7. 02:34AB Arms: Made in USA & Veteran Owned
  8. 03:00Bolt & Carrier Group: Heart of the Rifle
  9. 03:25Bolt Specifications: Carpenter 158 Steel
  10. 03:35Shot Peening and Testing (MPI/HP)
  11. 03:47NiB-X Nickel Boron Coating Benefits
  12. 04:20Extractor Details: E 4140 Steel
  13. 04:41M16 Bolt Carrier Explained
  14. 05:16Carrier Material & Interior Chrome Lining
  15. 05:24Bolt Carrier Key & Staking Importance
  16. 05:44Cam Pin & Firing Pin Specs
  17. 05:52Bolt After Use: Carbon Buildup Test
  18. 06:37Gas Rings & Chamber Lock-up
  19. 06:50Lubrication and Smoothness Benefits
  20. 07:10Carrier Riding in Receiver vs. Bolt Lock-up
  21. 07:30AB Arms Standard Mil-Spec Carriers & Pricing
  22. 07:39AB Arms NiB-X Bolt Carrier Group Pricing
  23. 07:56Purchasing Bolt Separately
  24. 08:03AB Arms Commitment to US Manufacturing
  25. 08:24Peace of Mind for Critical Parts
  26. 08:27Go-To Gun: Wanting the Best
  27. 08:30AB Arms Handguards & Rails
  28. 08:50AB Arms Website & Product Quality
  29. 08:56Conclusion: Veteran Owned, USA Made
  30. 09:25Recap: Nickel Boron Bolt Pricing

Frequently Asked Questions

What are the main advantages of a nickel boron coated bolt carrier group for an AR-15?

Nickel boron coating provides self-lubricating properties, significantly reducing friction and wear. It also offers excellent foul resistance, preventing carbon and debris from adhering to the bolt, which leads to easier cleaning and improved reliability, even when run with minimal lubrication.

What materials does AB Arms use for their AR-15 bolts and bolt carriers?

AB Arms uses Carpenter 158 steel for their bolts, heat-treated to mil-spec standards. Their M16 bolt carriers are made from 8620 steel, with the carrier key constructed from 4130 steel. The extractor is made from E 4140 steel, and the firing pin from S7 steel.

Why is the M16 bolt carrier considered beneficial for an AR-15?

The M16 bolt carrier has a slightly extended rear section that adds a bit more mass. This can help slow the rate of fire slightly and improve the overall balance and function of the bolt carrier group within the AR-15 platform, contributing to smoother operation.

What quality control measures does AB Arms employ for their bolts?

AB Arms ensures the quality of their bolts by using Carpenter 158 steel, heat-treating to mil-spec, shot peening for surface hardening, and performing MPI (Magnetic Particle Testing) and HP (High Pressure Testing) to detect any potential flaws.

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