The TacFire BU9MM4 Pistol Upper Assembly 9mm Luger pairs a compact 4" black nitride barrel with a sleek 7075-T6 aluminum black anodized receiver and ventilated M-LOK handguard. This complete AR-platform upper arrives fully assembled with a bolt carrier group and a flat-top rail, giving shooters a clean, modern foundation for their preferred optics and accessories.

Designed for 9mm AR pistol builds, this upper is ideal for range use, training, and building a compact personal-defense carbine when paired with a compatible lower. The short barrel and free-float M-LOK handguard help keep the package maneuverable while maintaining stability for accurate shooting. TacFire’s attention to machining, fit, and finish makes the BU9MM4 a dependable choice for builders who value straightforward performance and solid craftsmanship.

• Manufacturer: TacFire
• Model: BU9MM4 Pistol Upper Assembly
• Caliber: 9mm Luger
• Action: 9mm
• Barrel Length: 4"
• Barrel Finish: Black Nitride
• Receiver Finish: Black Anodized
• Handguard: M-LOK
• Product Type: Complete Upper Assembly
• Sights: Optic Ready
• Includes: Bolt Carrier Group