.308 / 7.62x51 NiB 9310 MPI BDG Bolt Carrier Group BCG.

PROUDLY MADE IN THE USA!

.308 / 7.62x51 Complete Nickel Boron Bolt Carrier Group.

.308/7.62x51 Caliber BDG Nickel Boron Bolt Carrier Group. We are having these built to our exacting Standards. The Bolt is shot peened and manufactured out of 9310 Tool Steel with a 4140 Machined Extractor. The Carrier is the more common DPMS pattern with a Nickel Boron finish for easier cleaning and provides a slicker surface. The Gas Key is Hardened to USGI Specifications and fastened to the carrier using Grade 8 Hardware, and then properly staked. More information below.

Assembly: 
The assembly requirements for our Bolt Carrier Groups are much higher than most. Before assembling the gas key to the carrier, permatex NO.3D aviation is applied to form-a-gasket around the gas hole (per MIL-SPEC). Then Grade-8 hardware is used to attach the gas key, followed by properly staking per spec. When installing the extractor to the bolt, both the extractor buffer and the crane-o-ring are inserted with the spring. Both are present to insure proper ejection 100% of the time. Then high temperature grease is app to the gas rings before inserting the bolt into the carrier, which allows for much smoother operation. These BCGs are inspected to the highest of standards, to insure a high quality product that is 100% reliable for our customers…PROUDLY MADE IN THE USA!

Carrier: 
DPMS Pattern. Will operate flawlessly in civilian AR .308 / 7.62x51 platforms. 
Machined from 8620 tool steel 
Heat treated to military specifications

Bolt: 
Machined from 9310 tool steel 
Heat treated to military specifications 
Shot Peened 
Ground to meet military required tolerances 
MPI (Mag Particle Inspected)

Gas Key: 
Machined from 4140 
Heat treated to military specifications

Extractor: 
Machined from 4140 
Heat treated to military specifications 
Shot peened

Firing Pin: 
Machined from 8640 tool steel 
Heat treated to military specifications 
Ground to meet military required tolerances 
Coated with .0002”-.0003” of hard chrome per MIL-STD-171 1.2.2.2

Cam Pin: 
Machined from 4340 
Heat treated to military specifications 
Ground to meet military required tolerances