Aero Precision AR15 5.56 PRO Series Bolt Carrier Group – Black Nitride


5.56 NATO / .223 Rem, 9310 Steel Bolt, Black Nitride, Shot Peened, MPI inspected

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Aero Precision AR15 5.56 PRO Series Bolt Carrier Group – Black Nitride

The Aero Precision PRO 5.56 Bolt Carrier Group is built from the ground up to meet the demands of the most extreme conditions. Each component and manufacturing process of the PRO 5.56 Bolt Carrier Group was deliberately chosen to increase the reliable service life of the bolt carrier group and its components.


The bolt is one of the most important parts of the bolt carrier group. Machined from 9310 steel, a proprietary flash nitride process was chosen to ensure proper heat treatment on the bolt. When properly heat treated, 9310 steel provides superior strength and durability when compared to C158.

The cam pin channel is counter bored, eliminating the need for swaging. Swaging is the industry standard, however this process creates more stress on the bolt during manufacturing by displacing material rather than cutting it to the proper dimension from the start.

Cam Pin

Each PRO cam pin is precision ground after heat treatment to exacting specifications and given a nitride finish.

The cam pin features an engraved indexing mark on one side of the cam pin face; a concept that has been popularized by Chad Albrecht at School of the American Rifle. Cam pins traditionally wear more heavily on one side and when installed inconsistently can create excessive wear over time. When the cam pin becomes “loose” this can create excessive wear on the bolt itself shortening overall life. The indexing mark allows for consistent installation during maintenance which in turn reduces wear on not only the cam pin but the bolt over time to help extend overall service life.


The extractor features a phosphate finish. The extractor is one of the few places where it is beneficial to have a “rougher” finish as it allows for more positive engagement with the case when pulling it out of the chamber.


Each PRO BCG utilized an M16 cut carrier and features a nitride finish. Internal critical surfaces are precision ground to exacting tolerances to ensure optimal gas efficiency. The same machining standards are used for the carrier rails providing a super smooth fit and function from the start.

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Product Information
Manufacturer Leading U.S. Manufacturer
100% American Made Yes
Caliber 5.56 NATO | 223 Rem
Finish Black Nitride
Platform AR15
Compatability Works with standard Milspec AR15 components
Weight 11.4 oz
Bolt Specs
Material 9310 Steel
Extractor 4140 Billet Steel, O-Ring, Phosphate
Cam Pin 4140 Steel; Engraved Index Marking
Firing Pin 8640 Steel; Nitride Finish
Ejector S7 Tool Steel
Finish Black Nitride+
Other MPI, Shot Peened, Heat Treated
Carrier Specs
Material 8620 Steel
Type M16 Full-Auto
Gas Key 4140 Billet Steel; Grade 8 Fastners
Finish Precision Ground; Black Nitride
Other Heat Treated

Arm or Ally is a stocking dealer for all Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, CMC Triggers, HIPERFIRE and named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!  See our growing inventory of AR Parts, and Reloading Components.

Weight 15 oz
Dimensions 8 × 4 × 2 in
Part Type

Bolt Carrier Group, Upper Receiver Parts




5.56 NATO

Coating Type

Black Nitride

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