Rock River Arms forged aluminum A4 style upper receiver with ejection port cover and forward assist installed. Features M4 feed ramps.
Paired with the Brownells B-TAC Bolt Carrier Group and Brownells Charging Handle.
The Complete M16 B-TAC Bolt Carrier Group boasts:
- Fully assembled Bolt Carrier Group; including the bolt, bolt carrier, gas key, firing pin, cam pin, and firing pin retaining pin
- Every Bolt is High Pressure Tested (HPT) with a proof load
- Following the High Pressure Test, every Bolt is Magnetic Particle Inspected (MPI)
- The Bolt is machined from 9310 steel
- Following machining, the Bolt is heat treated and shot peened
- Installed extractor includes black rubber insert with spring
- M16 Bolt Carrier is machined from 8620 steel and hardened
- M16 Bolt Carrier will function in semi-auto or full-auto AR-15/M16
- Gas Key Screws are properly torqued and staked
- Bolt and Bolt Carrier feature a matte black ntride finish
And the Brownells Charging handle is machined from aluminum with a matte black anodized finish.