The TacFire BU-45ACP-7 Pistol Upper Assembly .45 ACP – BU45ACP7 (UPC: 729205517822) is a compact, hard-hitting AR-platform .45 ACP upper built for shooters who want big-bore performance in a maneuverable pistol package. Featuring a 7" black nitride barrel, a black anodized 7075-T6 aluminum receiver, and a free-float M-LOK handguard, this complete upper is ready to drop onto your compatible AR lower and run.
Designed as a fully assembled unit that includes a bolt carrier group, the TacFire BU-45ACP-7 delivers reliable .45 ACP performance for range work, defensive training, PCC competitions, or just building a fun and unique AR pistol.
Key Specs – TacFire BU-45ACP-7 Pistol Upper Assembly
Manufacturer: TacFire
Model: BU-45ACP-7 Pistol Upper Assembly
SKU / MPN: BU45ACP7
UPC: 729205517822
Caliber: .45 ACP
Barrel Length: 7"
Barrel Finish: Black nitride
Receiver Material: 7075-T6 aluminum, black anodized
Handguard: Free-float M-LOK handguard
Upper Type: AR-platform pistol upper, complete
Included: Bolt carrier group (BCG)
Sights: None, optic ready (flat top Picatinny rail)
Compact 7" Black Nitride Barrel – Big-Bore Performance in a Small Package
At the heart of this upper is a 7-inch .45 ACP barrel finished in black nitride for durability and smooth function:
The compact 7" length keeps your build short, fast, and easy to maneuver around vehicles, barricades, and tight spaces.
Black nitride treatment hardens the barrel surface, improving wear resistance, corrosion resistance, and ease of cleaning compared to standard phosphate finishes.
Optimized for pistol-length .45 ACP performance, this barrel is ideal for close- to mid-range shooting, steel matches, and practical training.
If you want the stopping power and soft recoil of .45 ACP in an AR-platform pistol or SBR, this barrel length hits the sweet spot.
7075-T6 Aluminum Receiver – Strong, Lightweight, and Hard-Anodized
The upper receiver is crafted from 7075-T6 aluminum, the same high-strength alloy used in quality AR-15 rifles, and finished in a tough black anodizing:
7075-T6 construction offers superior strength-to-weight ratio for long-term durability.
Hard anodized black finish helps protect against scratches, abrasion, and harsh environments.
Flat-top design with a Picatinny rail provides a stable mounting platform for red dots, LPVOs, or backup sights.
This receiver gives you a solid foundation for a dependable AR-45 pistol build without unnecessary weight.
Free-Float M-LOK Handguard – Accessory-Ready and Slim Profile
The TacFire BU-45ACP-7 upper comes equipped with a free-float M-LOK handguard, giving you modern modularity and a comfortable grip:
M-LOK slots let you mount lights, lasers, handstops, and vertical grips exactly where you need them.
Free-float design can enhance accuracy potential by preventing pressure on the barrel from slings or accessories.
Slim, lightweight profile that’s easy to control during rapid strings of fire.
Whether you’re building a defensive pistol, a suppressor-ready host, or a PCC-style setup, this M-LOK handguard keeps your options wide open.
Complete Upper – Includes Bolt Carrier Group
One of the biggest advantages of the TacFire BU45ACP7 is that it’s sold as a complete upper assembly:
Includes bolt carrier group (BCG) matched for .45 ACP operation.
Fully assembled from the factory, minimizing the need for extra parts or specialized tools.
Designed to be ready to pin onto a compatible AR lower receiver configured for .45 ACP (magazine system and buffer setup dependent on your specific build).
This makes it a great choice if you want to convert a dedicated .45 ACP lower or start a new AR-45 build with a proven, turnkey upper.
Optic-Ready AR-45 Pistol Upper
The BU-45ACP-7 comes without fixed sights, making it optic-ready right out of the box:
Flat-top Picatinny rail allows you to add your preferred red dot, holographic sight, or scope.
Easy to co-witness with flip-up backup sights if desired.
Clean, uncluttered upper configuration tailored to modern optics-driven shooting.
This flexibility lets you set up the upper for your specific mission—home defense, competition, training, or range fun.
Built for .45 ACP AR-Platform Performance
Chambered in .45 ACP, this TacFire upper offers a unique combination of big-bore punch and controllable recoil in the AR format:
Ideal for shooters who prefer heavy, subsonic-friendly pistol calibers in an AR platform.
Excellent option for PCC-style shooting, close-quarters training, and defensive drills.
Pairs well with appropriate muzzle devices or suppressors (where legal) for soft-shooting setups.
If you already stock .45 ACP for pistols, this upper lets you streamline ammo across platforms while enjoying the ergonomics and modularity of the AR.
Ideal Uses for the TacFire BU-45ACP-7 Upper
The TacFire BU-45ACP-7 Pistol Upper Assembly is a smart choice for:
Building a compact AR-45 pistol for home defense or truck-gun roles
Creating a range toy that’s fun, different, and hits steel with authority
PCC-style competition builds using .45 ACP
Shooters who want a complete, ready-to-run upper instead of piecing together individual components
With its 7" black nitride barrel, black anodized 7075-T6 receiver, free-float M-LOK handguard, included BCG, and optic-ready design, the BU45ACP7 brings serious value and performance to any .45 ACP AR project.
SEO-Friendly Product Highlights
Product Name: TacFire BU-45ACP-7 Pistol Upper Assembly 45 ACP
Model / SKU: BU45ACP7
UPC: 729205517822
Caliber: .45 ACP
Barrel: 7" black nitride, AR-platform pistol length
Receiver: Black anodized 7075-T6 aluminum
Handguard: Free-float M-LOK, accessory-ready
Includes: Bolt carrier group (complete upper)
Platform: AR-style .45 ACP pistol upper, optic ready, no sights
If you’re building an AR-45 pistol and want a compact, complete upper that combines robust materials, modern features, and the proven .45 ACP cartridge, the TacFire BU-45ACP-7 Pistol Upper Assembly is an outstanding foundation for your next build.
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