TacFire 9mm/.45 ACP Billet Slickside Stripped Upper Receiver Black - UP04

TacFire UP04 9mm 45 Billet Slickside Pistol Caliber Stripped Upper Receiver UP04 UPC 729205740329

Product Description

The TacFire UP04 9mm/.45 ACP Billet Slickside Stripped Upper Receiver is a dedicated pistol caliber carbine (PCC) upper receiver engineered specifically for AR-9 and AR-45 blowback builds. CNC-machined from aircraft-grade 6061-T6 billet aluminum, this upper receiver features a sleek "slickside" design that omits the traditional forward assist and dust cover door, reducing unnecessary weight and eliminating unneeded mechanical complexities for blowback systems.

Designed with an oversized ejection port specifically proportioned for reliable clearance of 9mm Luger, .40 S&W, .357 SIG, and .45 ACP spent casings, the UP04 prevents casing stovepipes during rapid cycling. The full-length top MIL-STD-1913 Picatinny rail aligns seamlessly with standard AR-15 handguards and lower receiver rails for mounting red dot optics and iron sight systems.

Finished in a durable Matte Black Type III Hard-Coat Anodization, the TacFire UP04 upper receiver features precise internal barrel extension tolerances and standard 1.25"-18 barrel nut threading. Compatible with standard AR-15 charging handles, blowback bolt carrier groups (BCGs), and dedicated PCC lower receivers (Glock, Colt, or stern adapter modules), it serves as a lightweight foundation for custom pistol caliber builds.

*Armorer Bench Notes & Real-World Staging Guidance:*

Fitment Matrix: Fits standard Mil-Spec AR-15 lower receivers and dedicated PCC lowers (Glock / Colt / MP5 magazine patterns). Designed for blowback 9mm, .40 S&W, and .45 ACP barrel and BCG assemblies.

1. Ensure the working area is clean and all build components are verified empty and free of ammunition.
2. Install the 9mm or .45 ACP barrel into the upper receiver barrel extension socket, ensuring the barrel index pin seats fully into the top alignment notch.
3. Apply anti-seize grease to the external upper receiver threads and torque the barrel nut to manufacturer specs (typically 35–50 ft-lbs).
4. Slide a blowback PCC bolt carrier group and standard AR-15 charging handle into the receiver channel. Mate with lower receiver and verify smooth manual cycling before live-fire testing.

Key Features

• Dedicated PCC Slickside Profile: Eliminates forward assist and ejection port cover for a clean, lightweight, snag-free housing.
• Enlarged Ejection Port Geometry: Proportioned specifically for smooth ejection of 9mm, .40 S&W, and .45 ACP spent cartridge cases.
• Precision 6061-T6 Billet Aluminum: CNC-machined structure provides superior rigidity and precise internal BCG track alignment.
• Type III Hard-Coat Anodized Finish: Resists corrosion, scratch wear, and chemical exposure from carbon cleaning solvents.
• Mil-Spec Top Picatinny Rail: Standard 1913 optic rail connects flush with AR-15 handguard rails for seamless red dot staging.

Product Specifications

• Brand: TacFire
• Model/Series: Billet Slickside Pistol Caliber Upper Receiver
• MPN / SKU: UP04 / UP04
• UPC: 729205740329
• Caliber Compatibility: 9mm Luger / .40 S&W / .357 SIG / .45 ACP
• Material: 6061-T6 Billet Aircraft Aluminum
• Barrel Nut Threads: Standard 1.25"-18 TPI
• Forward Assist / Dust Cover: None (Slickside Configuration)
• Finish/Color: Matte Black Hard-Coat Anodized
• Country of Origin: United States