**IN-STOCK** Rainier Arms NiB AR15/M16 BCG’s
Posted on May 10th, 2013 by ar15newsMy favorite retailer of all time, Rainier Arms, has some of their Thunder Bolt BCG’s in-stock right now. These are all M16/Full Auto, Nickel Boron (NiB) coated, HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected), bolts are 158 Carpenter steel and come with a Lifetime Warranty. If you’ve been looking for a new NiB BCG for your AR, this is a sweet one. Tons of details listed below. Purchase at RainierArms.com for just $199.95.
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.
Carrier:
- SAE 8620
- Heat Treated
- Nickel Boron Plated
Bolt:
- Carpenter A-158
- Shot Peened
- Heat Treated
- Nickel Boron Plated
Extractor:
- Machined from bar
- Shot Peened
- Heat Treated
- Nickel Boron Plated
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
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.

























































