


The Aero Precision PRO Series 5.56 Bolt Carrier Group is engineered from the ground up to withstand the demands of the most extreme conditions. Every component and every manufacturing process was deliberately selected to maximize the reliable service life of the bolt carrier group and its individual parts. From the 9310 steel bolt with its proprietary flash-nitride heat treatment to the M16-cut carrier with precision-ground internal surfaces, this BCG represents the pinnacle of AR-15 component engineering. Whether you are building a competition rifle or a duty firearm, the PRO Series BCG delivers consistent, smooth, and reliable performance from the first round to the last.
Product Highlights
- M16 Style Cut Carrier: Machined from 8620 steel with a nitride finish; internal critical surfaces are precision ground to exacting tolerances for optimal gas efficiency and ultra-smooth cycling.
- Superior 9310 Steel Bolt: Shot peened and Mag Particle Inspected (MPI) tested; heat treated via a proprietary flash-nitride process that delivers superior strength and durability compared to standard C158 steel.
- Precision Cam Pin with Engraved Indexing Mark: Machined from 4140 steel and precision ground after heat treatment; the engraved indexing mark ensures consistent installation to reduce wear on both the cam pin and bolt over time.
- Mil-Spec Gas Key: Machined from hardened 4140 steel, torqued to spec with grade 8 hex fasteners, properly staked to mil-spec, and finished with a nitride coating for lasting corrosion resistance.
- S7 Tool Steel Ejector and 8640 Steel Firing Pin: Each component is purpose-built from performance-grade materials with nitride finishes to ensure long-term reliability under sustained fire.
Specs
- Brand: Aero Precision
- Model: PRO Series Bolt Carrier Group
- Caliber/Cartridge: 5.56mm NATO
- Compatible Platform: AR-15
- Carrier Style: M16 Cut
- Finish: Black Nitride
- Bolt Material: 9310 Steel
- Carrier Material: 8620 Steel
- Cam Pin Material: 4140 Steel (precision ground, heat treated)
- Gas Key Material: Hardened 4140 Steel
- Ejector Material: S7 Tool Steel
- Firing Pin Material: 8640 Steel
- Bolt Treatment: Shot Peened, MPI Tested, Flash Nitride Heat Treated
- Gas Key Staking: Mil-Spec, Grade 8 Hex Fasteners
- Weight: 11.4 oz
- Length: 11.25 inches
- Width: 4.00 inches
- Country of Manufacture: United States
- UPC: 815421029949
- MPN: APRH101767C
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