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Rainier Arms AR-15 Precision Match Grade BCG - Nitride

Rainier Arms

Rainier Arms AR-15 Precision Match Grade BCG - Nitride


The Rainier Arms Precision Match Grade Phosphate 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.


  • Full Auto Carrier
  • SAE 8620
  • Heat Treated
  • 5.56/.223
  • Carpenter 158 Steel
  • Shot Peened
  • Heat Treated
  • Machined from bar
  • Shot Peened
  • Heat Treated
  • Maganese Phosphate
  • Nitride
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
Firing Pin Retaining Pin:
  • Precision bent
  • Precision cut to length
  • Heat Treated
Gas Rings:
  • Stainless Steel per Mil-Spec
  • 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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