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Rainier Arms Thunder Bolt Carrier Group BCG HPT/MPI/Shot Peened [RA-BCG]  $159.95  $138.95 

Rainier Arms Thunder Bolt™ BCG HPT/MPI/Shot Peened AR15 M16



The Thunder Bolt™ BCG was created to meet and exceed all Mil Spec standards. Giving you the confidence to run your weapon long and hard at 110%. You will never have to worry about your BCG being the weakest link in your weapon. The bolts are HPT & MPI tested & Marked to give you ultimate confidence in your weapon system.


  • SAE 8620
  • Heat Treated
  • Manganese Phosphate with Hard Chrome Lined Bore


  • Carpenter A-158
  • Shot Peened
  • Heat Treated
  • Manganese Phosphate Coating


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

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
  • Hard Chrome Plated

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
  • Maganese Phosphate Coating

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
  • Black Zinc Coating

Limited Lifetime Warranty
We are so confident in our Rainier Arms Thunder Bolt BCG we offer them with a limited lifetime warranty. So if at anytime your Rainier Arms Thunder Bolt BCG breaks on your during normal use(Intentional abuse & Gas Key wear not included) we will replace it.

*We have “toned down” the logos due to customer response and lowered the price for your benefit.


This product was added to our catalog on Saturday 26 March, 2011.
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