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Great Deal!! – AIM Surplus Nickel Boron .308 BCG

Posted on February 16th, 2015 by ar15news

The last year has seen an explosion of interest in building big bore AR’s, especially the AR-10/.308. Things like .308 receiver sets and barrels are not only a lot more readily available but also much more affordable than they ever have been before. Unfortunately some smaller parts like Bolt Carrier Groups are still not so easy to find and can cost quite a bit. This weekend I happened to run across the AIM Surplus Nickel Boron .308/7.62×51 BCG and was surprised to see that not only does it look like a very high quality BCG but they are selling it for just $179.95 with FREE SHIPPING in the lower 48 States. I just finished up my second .308 build over the weekend and might need to pick up one of these BCGs for the next .308 build.

AIM Surplus NiB 308 BCG

AIM .308/7.62×51 Caliber BDG Nickel Boron Bolt Carrier Groups. A great BCG at an even better price! 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.


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 i 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!

—  Machined from 8620 tool steel
–  Heat treated to military specifications

—  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

—  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

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

Purchase now at

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