The Tactical Solutions Pac-Lite IV (brand part number PLIV45TEMODNF) is a lightweight aluminum upper built to replace the factory upper on a Ruger Mark IV or Mark IV 22/45 pistol, cutting weight and improving both accuracy and reliability over the stock unit. This 4.5-inch-barrel version installs directly onto an existing Mark IV frame without needing a gunsmith, and it’s finished in a matte olive drab color for shooters who want a different look than the factory finish. Inside, a stainless steel breech face and receiver hold up to repeated cycling, and the barrel is drilled and tapped for Tactical Solutions’ own Pac-Lite scope bases, with a thread protector end cap included over the 1/2×28-threaded muzzle. This is a top-end upper replacement, not a complete firearm — it installs on an existing Ruger Mark IV frame rather than shipping as its own standalone pistol.

Key Specifications

• Replaces the factory upper on a Ruger Mark IV or Mark IV 22/45 pistol.
• Barrel measures 4.5 inches.
• Cut with a 1:16 twist rate and an 11-degree target crown.
• Threaded 1/2×28, with a thread protector end cap included.
• Uses a stainless steel breech face and receiver with a lightweight aluminum barrel.
• Weighs approximately 8.5 ounces.
• Finished in matte olive drab.
• Drilled and tapped for Pac-Lite scope bases.

Frequently Asked Questions

Is this a complete pistol? No, it’s a replacement upper that installs onto an existing Ruger Mark IV or Mark IV 22/45 frame.

Do I need a gunsmith to install it? No, it’s designed to install onto an existing Mark IV frame without gunsmith fitting.

Buy the Tactical Solutions Pac-Lite IV Upper

Lighten up and tighten your Mark IV’s accuracy with a direct-fit upper. Order the Pac-Lite IV from our Tactical Solutions lineup of handgun parts and accessories, and our Lubbock, Texas team will get it ready to ship as soon as it’s available.