TACSOL Pac-Lite IV Ruger Mark IV 22LR 4.5" Barrel - Olive Drab Green

The TACSOL Pac-Lite IV for Ruger Mark IV 22LR is a drop-in barrel upgrade that transforms your .22 pistol into a tack-driving, lightweight shooter. Built for Mark IV and Mark IV 22/45 frames, this 4.5" barrel replaces your factory upper without gunsmith help, giving you noticeably better balance, reduced weight, and improved accuracy in a compact package. Whether you're running rimfire practice at the range, teaching new shooters, or chasing steel targets, the Pac-Lite IV delivers the kind of performance boost that feels like you leveled up your game.

The barrel itself is machined from lightweight aluminum with a stainless steel breech face and receiver, keeping the whole package nimble at just 8.5 ounces. The 1-in-16" rifling twist and 11-degree target crown are designed for reliable, consistent accuracy with standard and high-velocity .22LR loads. Threading is .5" x 28 for easy suppressor or compensator mounting, and the included thread protector keeps things clean in your range bag. The Olive Drab Green finish is durable and aesthetically solid—functional color that looks the part without fuss.

Installation is straightforward: the barrel and receiver assembly slides onto your existing Mark IV frame and locks in place. No special tools, no visit to the gunsmith, no waiting. The barrel comes drilled and tapped for Pac-Lite scope bases, so mounting optics is plug-and-play if you want to push accuracy further. It's the kind of upgrade that makes sense whether you're building a tack driver, refreshing an older Mark IV, or just tired of fighting with factory tolerances.

Key Features

• Lightweight aluminum barrel and receiver construction reduces overall weight and improves handling
• Drop-in design fits Ruger Mark IV and Mark IV 22/45 frames with no gunsmith required
• Stainless steel breech face for durability and reliable feeding
• 1-in-16" twist rate and 11-degree target crown optimized for .22LR accuracy
• .5" x 28 threaded muzzle accepts suppressors and compensators
• Pre-drilled and tapped for Pac-Lite scope bases
• Includes thread protector (end cap)
• Olive Drab Green finish is corrosion-resistant and field-proven

Specifications

Frequently Asked Questions

Will this barrel fit my Ruger Mark IV?

Yes, the Pac-Lite IV is designed as a drop-in upgrade for Ruger Mark IV and Mark IV 22/45 frames. It replaces the factory upper assembly and requires no gunsmith installation.

Can I mount a suppressor or optic on this barrel?

The barrel features a .5" x 28 threaded muzzle, so it will accept standard .22LR suppressors and compensators. It's also pre-drilled and tapped for Pac-Lite scope bases, allowing you to mount optics directly.

How much weight does the Pac-Lite IV save compared to factory?

The complete barrel and receiver assembly weighs 8.5 ounces. The lightweight aluminum construction and reduced profile deliver noticeably better balance and handling than the heavier factory upper.

What ammunition works with the 1-in-16 twist rate?

The 1-in-16" rifling twist is designed to stabilize standard and high-velocity .22LR loads reliably. This twist rate is a proven match for the full range of common .22LR ammunition.