TacFire BU45ACP4 .45 ACP 4" AR-15 Complete Upper - Black Nitride

The TacFire BU45ACP4 is a complete .45 ACP upper assembly built around a compact 4" black nitride barrel. The slow 1:16 rifling twist is matched to heavy .45 ACP projectiles for reliable stabilization, and the muzzle is threaded 5/8x24 for compensator, suppressor, or other muzzle-device fitment.

The receiver is machined from 7075-T6 aluminum and finished in black anodize, topped with a full-length Picatinny rail for optics, red dots, and back-up iron sights. A free-float M-LOK handguard keeps the barrel unobstructed for consistent accuracy while providing a slim, modular platform for lights, lasers, and foregrips. A dedicated .45 ACP bolt carrier group is included, so the upper drops onto any standard AR-15 lower and is ready to run.

Purpose-built for pistol-caliber AR builds, the BU45ACP4 is a natural fit for short-barreled rifle, AR pistol, and PCC configurations chambered in .45 ACP. This listing is for the upper only - a lower receiver, magazine, rear sight, and muzzle device are not included.