Tactical Solutions Pac-Lite 6" Threaded & Fluted Barrel for Ruger Mark IV/22/45 - .22 LR, Black Anodized, Adjustable Sights

The Tactical Solutions Pac-Lite 6" threaded and fluted barrel for Ruger Mark IV and 22/45 platforms is a lightweight upgrade engineered for shooters who want to dial in accuracy without the weight penalty of factory uppers. Built from aluminum with a stainless steel breech face, this 6-inch barrel cuts down on overall mass—tipping the scales at just 9.5 ounces—while the fluting and 11-degree target crown work together to improve shot placement. If you run a Mark IV or 22/45 and spend time at the range or in small-game hunting scenarios, this barrel swap delivers noticeable handling improvements and tighter groups without requiring a gunsmith to install.

Installation is straightforward—the Pac-Lite upper replaces your factory upper on your existing Mark IV or 22/45 frame with no special tools needed. The 1:16 twist rate is optimized for standard .22 LR ammunition, and the threaded muzzle (1/2 x 28) opens up suppressor options if you're looking to run quiet. The barrel comes threaded and ready to mount Pac-Lite scope bases, with a thread protector (end cap) included to keep the crown protected when you're not suppressed. Black anodized finish stands up to regular handling and provides a clean, no-fuss aesthetic.

Whether you're dialing in a precision .22 setup for target work, hunting small game, or just want a more balanced Mark IV platform, the Pac-Lite barrel gives you measurable improvements in weight distribution and accuracy at a fraction of the cost of a new pistol. The aluminum-and-stainless construction keeps things light while the stainless breech face ensures reliability through thousands of rounds.

Key Features

• 6-inch threaded and fluted barrel reduces weight to 9.5 ounces for improved balance
• Lightweight aluminum barrel with stainless steel breech face for durability and reliability
• 11-degree target crown for improved accuracy
• 1/2 x 28 threading supports .22 LR suppressors and accessories
• 1:16 twist rate optimized for standard .22 LR ammunition
• Drilled and tapped for Pac-Lite scope bases
• No gunsmith installation required—replaces factory upper on existing frame
• Black anodized finish
• Thread protector included

Specifications

Frequently Asked Questions

Will this Pac-Lite barrel fit my Ruger Mark IV or 22/45?

Yes. The Tactical Solutions Pac-Lite barrel is designed specifically as a drop-in upper replacement for Ruger Mark IV and Mark IV 22/45 frames. No gunsmith is required—installation is straightforward and requires no special tools.

Can I use a suppressor on this barrel?

Yes. The barrel features a 1/2 x 28 threaded muzzle, which is the standard threading for .22 LR suppressors and accessories. A thread protector is included to protect the crown when unsuppressed.

What is the twist rate, and what ammunition does it stabilize?

The Pac-Lite barrel has a 1:16 twist rate, optimized for standard .22 LR ammunition. This twist rate is ideal for standard velocity and high-velocity .22 LR rounds commonly used in target and hunting applications.

Is this barrel drilled and tapped for optics?

Yes. The barrel is drilled and tapped for Pac-Lite scope bases, allowing you to mount optics without modification. You'll need to source the compatible Pac-Lite bases separately.