TacFire BU-556-7 Pistol Upper 5.56 NATO, 7″ Barrel

The TacFire BU-556-7 is a complete AR-platform pistol upper built for compact, short-barrel applications. It is chambered for 5.56x45mm NATO and ships ready to mount on a compatible lower receiver. The assembly includes a bolt carrier group and features an M-LOK handguard and a black nitride finished barrel for durable service.

Key Specifications

• Chambering is listed as 5.56x45mm NATO.
• Barrel length is 7 inches.
• Barrel finish is Black Nitride.
• Receiver is 7075-T6 aluminum, black anodized.
• Handguard type is M-LOK with a black finish.
• Sight provision is None; optic ready.
• Product configuration is a complete upper assembly.
• Includes Bolt Carrier Group with the upper.
• Weight listed as 3.66 (as provided).

This compact TacFire upper is well suited for short-barrel AR pistol builds and applications where maneuverability and a reduced overall length are priorities. With a durable black nitride barrel, M-LOK handguard, and 7075-T6 aluminum receiver, it delivers a practical balance of weight and rigidity for range use, training, and compact carry configurations.