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Rainier Arms Precision Match Grade Nickel Boron AR15 Bolt Assembly

Out of stock

Rainier Arms Nickel Boron AR15 Bolt


Nickel Boron exterior gives this bolt an incredibly hard finish that protects against wear and corrosion for the ultimate in durability. The extreme smoothness and built-in lubricity of the coating also reduces friction and gives carbon deposits nowhere to stick, so bolt can be easily wiped clean with a cloth or nylon brush.


  • 5.56/.223
  • Carpenter 158 Steel
  • Shot Peened
  • Heat Treated
  • Nickel Boron Plated


  • Machined from bar
  • Shot Peened
  • Heat Treated
  • Maganese Phosphate

Extractor Spring:

  • Chrome Silicone for Longer Life
  • Black Insert as per current Mil-Spec
  • "O" Ring is high temp resistant dark brown

Extractor Retaining Pin:

  • Precision Machined
  • Precision ground to diameter
  • Precision ground to length
  • Heat Treated


Weight: 1.5oz

More Information
Manufacturer Rainier Arms, LLC
Finish Nickel Boron
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