The Tactical Solutions Pac-Lite IV Upper (brand part number PLIV6TEMODRF) 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 6-inch fluted upper trims weight off the front end while tightening accuracy and improving reliability over the stock unit. Finished in Matte OD Green, it installs onto your existing MK frame without a gunsmith, giving your rimfire pistol a noticeably lighter swing and crisper feel. It is a proven upgrade for target shooters, plinkers, and anyone chasing tighter groups from their Mark IV.

Key Specifications

• Barrel length is 6 inches, giving a longer sight radius and added velocity over the shorter 4.5-inch option.
• Rifling twist rate is 1:16, matched to standard .22 LR bullet weights for consistent stabilization.
• Muzzle is threaded 1/2×28, ready to accept a suppressor or muzzle device.
• 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 9.5 ounces, noticeably lighter than the factory unit.
• Finish is Matte OD Green with fluting, trimming weight while giving the pistol a distinct look.

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.

Do I need a gunsmith to install it? No, it is designed to bolt onto your existing MK frame without fitting or gunsmithing.

Is the muzzle threaded? Yes, it comes threaded 1/2×28 for a suppressor or muzzle device.

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 this upper ships fast from our Lubbock, Texas gun shop.