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  • Rainier Arms Nickel Boron Bolt Carrier Group (BCG)
  • Rainier Arms Nickel Boron Bolt Carrier Group (BCG)

Rainier Arms Nickel Boron Bolt Carrier Group (BCG)

SOLD OUT

NOW HP TESTED!

The Rainier Arms Precision Match Grade Nickel Boron BCG - 5.56 is machined and finished to a higher standard to meet and exceed all Mil Spec. It is machined using the most precise equipment in the industry. The bolts are MPI/HP tested & Marked to give you ultimate confidence in your weapon system.

Carrier:

  • Full Auto Carrier
  • SAE 8620
  • Heat Treated
  • Nickel Boron Plated

Bolt:

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

Extractor:

  • 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

Firing Pin:

  • Machined and then precision ground for accuracy
  • Heat Treated

Gas Key Bolt:

  • Precision manufactured in house with extra deep knurling
  • Grade 8
  • 1200 degree locking patch is factory applied to threads to help insure long lasting tightness

Gas key:

  • Hard Chrome lined gas tube as per Mil-Spec
  • Bolts installed to proper torque
  • Staking on both sides of both bolts

Cam Pin:

  • Precision machined
  • Heat Treated
  • Nickel Boron Plated

Firing Pin Retaining Pin:

  • Precision bent
  • Precision cut to length
  • Heat Treated

Gas Rings:

  • Stainless Steel per Mil-Spec

Ejector:

  • Precision machined
  • Heat Treated

Ejector Spring:

  • Chrome Silicone
  • Precision ground ends

Ejector Retaining Pin:

  • Precision cut to length
  • Hard Chrome Plated

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