Rainier Arms BCG - AR-15 Precision Match Grade Nickel Boron

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

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