UWone77
24 August 2013, 16:01
Rainier Arms (http://www.rainierarms.com) has been putting out a lot of Bolt Carrier Groups lately. This latest version is their Match Grade Nickel Boron (https://www.rainierarms.com/?page=shop/detail&product_id=3936). Rainier Arms (http://www.rainierarms.com) says that these are machined to higher standards and tolerances than their standard Mil-spec Bolt Carrier Groups. The higher price reflects that machine time. To me this reminds me of the Young Manufacturing National Match Carriers (https://www.rainierarms.com/?page=shop/detail&product_id=1007).
Description:
The Rainier Arms Precision Match Grade Nickel Boron BCG 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 tested & Marked to give you ultimate confidence in your weapon system.
Carrier:
Full Auto 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 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.
http://i1016.photobucket.com/albums/af282/richdkim77/NiB_zps2017cda5.jpg (http://s1016.photobucket.com/user/richdkim77/media/NiB_zps2017cda5.jpg.html)
Description:
The Rainier Arms Precision Match Grade Nickel Boron BCG 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 tested & Marked to give you ultimate confidence in your weapon system.
Carrier:
Full Auto 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 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.
http://i1016.photobucket.com/albums/af282/richdkim77/NiB_zps2017cda5.jpg (http://s1016.photobucket.com/user/richdkim77/media/NiB_zps2017cda5.jpg.html)