TacFire BU9MM4 Pistol Upper Assembly 9mm Luger 4" Barrel M-LOK Handguard AR-Platform

The TacFire BU9MM4 is a complete 9mm Luger pistol upper assembly built for AR-platform pistols and lowers. It arrives fully assembled with a Bolt Carrier Group installed and ready to drop onto a Mil-spec AR-15 lower receiver, giving builders a fast path to a compact pistol-caliber AR.

The 4" barrel carries a black nitride finish for corrosion resistance and easier cleaning, paired with a 7075-T6 aluminum upper receiver finished in black anodized for the durability AR shooters expect. The M-LOK handguard offers a slim, modular mounting surface for accessories, and the upper ships optic ready so you can mount your preferred red dot or magnifier directly to the platform.

Operation on a standard AR-15 lower requires a 9mm magazine adapter block (sold separately) to accept pistol-caliber magazines. Once paired with the appropriate lower and adapter, this upper delivers a lightweight, compact pistol-caliber shooting platform.