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.
Bolt:
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.
- Machined from 9310 steel
- Shot peened
- MPI tested
- Proper heat treatment ensured via proprietary flash-nitriding process
Carrier:
Each PRO BCG utilizes a 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.
- Machined from 8620 steel
- M16 Cut Carrier
- Nitride Finish
- Critical surfaces precision ground for optimal gas efficiency and reliability
Gas Key:
- Machined from hardened 4140 steel
- Torqued to spec with grade 8 hex fasteners
- Properly staked to mil-spec
- Nitride finish
