Tactical Solutions Pac-Lite IV Upper 4.5-Inch Gun Metal Gray

The Tactical Solutions Pac-Lite IV Upper (brand part number PLIV45TEGMGRF) is a drop-in replacement barrel and upper assembly built to bolt onto your factory Ruger Mark IV or Mark IV 22/45 frame. Machined from lightweight aluminum with a stainless steel breech face and receiver, this 4.5-inch upper trims weight off the front end while tightening accuracy and improving reliability over the stock unit. Finished in Gun Metal Gray, it installs onto your existing MK frame without a gunsmith, giving your rimfire pistol a lighter, faster-pointing feel. It is a proven upgrade for target shooters, plinkers, and anyone chasing tighter groups from their Mark IV.

Key Specifications

• Barrel length is 4.5 inches, keeping the pistol short and quick to point for informal target work.
• Rifling twist rate is 1:16, matched to standard .22 LR bullet weights for consistent stabilization.
• Muzzle is threaded 1/2×28 and ships with a thread protector end cap installed.
• Crown is cut to an 11-degree target profile that protects the rifling and supports accuracy.
• Breech face and receiver are machined from stainless steel for long-term durability under repeated cycling.
• Barrel and receiver housing are built from lightweight aluminum, cutting overall weight versus the factory steel upper.
• Complete upper weighs approximately 8.5 ounces, noticeably lighter than the factory unit.
• Top of the barrel is drilled and tapped for Pac-Lite scope bases, ready for a red dot or scope mount.

Frequently Asked Questions

What frames does this upper fit? It is built as a factory upper replacement for the Ruger Mark IV and Mark IV 22/45.

Can I mount an optic on it? Yes, the barrel is drilled and tapped for Pac-Lite scope bases.

Does it come with a thread protector? Yes, a thread protector end cap is included with the 1/2×28 threaded muzzle.

Buy the Tactical Solutions Pac-Lite IV Upper

Lighten up your Mark IV and pick up accuracy at the same time. Explore more Tactical Solutions upgrades in our selection, and order it from our Lubbock, Texas gun shop.