The Tactical Solutions Pac-Lite IV is a .22 LR upper/barrel assembly for Ruger Mark IV and Mark IV 22/45 platforms. The 6-inch barrel is made from aluminum with a chromoly steel bore and is threaded 1/2 x 28 at the muzzle. 
 

Key Specifications 

• Barrel Length: 6 inches 
• Caliber: .22 LR 
• Condition: New in Box 
• Finish: Black 
• Frame Material: Aluminum 
• Manufacturer: Tactical Solutions 
• Model Part Number: PLIV6TEMBRF 
• Type: Uppers (Fits Mark IV and Mark IV 22/45) 
• UPC: 879971008052 
   

Detailed Features 

 
The aluminum construction reduces weight significantly versus a steel barrel assembly, which is the primary reason target shooters and plinkers choose the Pac-Lite. The chromoly steel bore liner gives you the accuracy and durability of steel where it counts while keeping the overall weight down. 
 
The 1-inch target diameter barrel profile adds rigidity and gives a stable mounting surface. The threading at 1/2 x 28 is the standard US suppressor thread pitch for .22 LR, meaning you can thread on a compatible suppressor or muzzle device without an adapter. 
 
The upper is drilled and tapped for Pac-Lite scope bases, so you can mount optics directly to the barrel assembly rather than using Ruger's factory receiver rail. This is a cleaner mounting solution for dedicated optics setups. 
 

Usage 

 
This is a drop-in replacement upper for Mark IV and Mark IV 22/45 owners who want lighter weight, a suppressor-ready thread, and a direct optics mounting option. It's popular for target shooting and suppressed plinking. Reliability is ammunition-dependent, as with all .22 LR semi-autos. High-velocity ammo with consistent priming performs best.

The Tactical Solutions Pac-Lite IV gets consistently positive feedback from Mark IV owners who upgrade for weight reduction and suppressor compatibility.

Lightweight construction is the most praised attribute. Owners consistently note the meaningful difference in balance after switching from the factory barrel assembly. For extended range sessions this matters: less muzzle-heavy feel and lower fatigue.

The threading for suppressors is well-received among suppressed .22 shooters. The 1/2 x 28 thread is standard, and the alignment is reported as consistent and clean.

Accuracy feedback is favorable. The chromoly bore and target-diameter profile give owners solid results at typical rimfire distances. The direct scope mounting option is appreciated by those running red dots or scopes for precision work.

The price point comes up occasionally. Tactical Solutions products carry a premium over factory steel alternatives. Most owners who buy specifically for weight and suppressor use feel it's justified; casual buyers sometimes question whether the upgrade cost is worth it relative to leaving the factory barrel in place.

Ammo sensitivity is the main practical note. Some owners report that the Pac-Lite is pickier about ammunition than the factory barrel, with cheap bulk ammo producing more malfunctions. Standard practice is to test several brands and stick with what cycles reliably.