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Posted on July 6th, 2016 by ar15news

I’m definitely going to have to pick up a few of these new NIB EXO BCG’s from AIM Surplus. The NIB EXO coating is simply amazing and well worth the extra money over a standard NIB finish. Combine the NIB EXO finish with the awesome specs of this BCG and this should be a real winner. I already have a few AIM Surplus BCG’s and they do a great job of offering a high quality product at a very good price point. This new BCG is made right here in the USA with a Lifetime Warranty and just $119.95 shipped. 

Pics and info below. Get more details and purchase at

Aim Surplus NIB EXO BCG 2

AIM AR/M16 5.56/.223/.300 BLACKOUT complete Bolt Carrier Groups now with UCT’s exclusive Nickel Boron EXO Technology coating. We are having these bolts manufactured to our exacting standards with no Frills added to be able to offer the best BCG at the Best Price. Features 9310 Bolt Material; 8620 carrier and gas key; Properly staked Investment cast gas key hardened to USGI specifications fastened with Hardened Grade 8 Fasteners; Shot peened MPI (Magnetic Particle Inspected) Bolt. Extractor insert installed. Proudly made in the USA with a Lifetime Warranty.

EXO Technology creates a competitive advantage for all kinds of components, because treated parts run dramatically longer and more accurately with less maintenance. Further, EXO greatly enhances heat dissipation, so treated products run far cooler than non-treated parts. The EXO process is permanent, lasting for the entire lifespan of treated parts. A patented, nodular nickel-boron (NiB) surface treatment, EXO nucleates on the surface atoms of metals, becoming part of the metal rather than merely applied to the outside. In addition, the treated surface becomes harder than the substrate itself, eliminating the cost, weight and degradation problems of conventional hardened metals. EXO Technology is featured in firearms, weapons and support systems used by the U.S. military and law enforcement and security agencies. EXO Technology is appropriate for virtually any application where reduced friction, extended service life, enhanced performance and lower maintenance are desirable.

–  M16 style (Auto)
–  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
–  Quench and temper heat treat
–  Ground to meet military required tolerances

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