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Tulammo
The TACSOL Pac-Lite IV for Ruger Mark IV .22LR is a lightweight upper receiver assembly that transforms your rimfire platform into a tack-driving, nimble shooter. Whether you're punching steel at the range, running a .22LR trainer build, or just want to shed unnecessary weight without sacrificing accuracy, this 6" barrel upgrade replaces your factory upper in minutes—no gunsmith required. At 9.5 ounces, the Pac-Lite IV's aluminum construction and stainless steel breech face deliver the balance and point-ability that turns casual plinking into precision work.
Tactical Solutions engineered the Pac-Lite IV to run reliably with both standard Mark IV frames and 22/45 variants. The 1:16" twist rate stabilizes .22LR bullets across the velocity spectrum, while the 11-degree target crown and 5/16 x 28 threads (with included protector cap) set you up for optics, suppressors, or clean iron sight shooting. Pre-drilled and tapped for Pac-Lite scope bases means mounting glass is straightforward—the whole package drops together like factory spec, but with the handling characteristics of a rifle half its weight.
The OD Green finish blends tactical aesthetics with that utilitarian look that works in the field, at the bench, or on the competition line. If you've been living with a heavy factory Mark IV upper, you'll feel the difference the moment you shoulder this upgrade. It's the kind of bolt-on improvement that makes your .22LR feel like a grown-up rifle.
| Caliber | .22LR |
| Barrel Length | 6" |
| Weight | 9.5 oz |
| Twist Rate | 1:16" |
| Thread Pattern | 5/16 x 28 |
| Crown Style | 11-degree target crown |
| Finish | OD Green |
| Included Accessories | Thread protector (end cap) |
Yes. The Pac-Lite IV upper assembly is designed to drop onto existing Ruger Mark IV and Mark IV 22/45 frames without modification. Installation requires no gunsmith.
The barrel and receiver are pre-drilled and tapped for Pac-Lite scope bases, which are sold separately. It ships with a thread protector (end cap) for the muzzle.
The Pac-Lite IV features a 5/16 x 28 thread pattern, standard for .22LR rimfire platforms.
The Pac-Lite IV weighs 9.5 ounces. Specific factory upper weights vary, but the aluminum construction and optimized design philosophy result in a noticeably lighter, better-balanced rifle compared to standard factory assemblies.
Tulammo
The TACSOL Pac-Lite IV for Ruger Mark IV .22LR is a lightweight upper receiver assembly that transforms your rimfire platform into a tack-driving, nimble shooter. Whether you're punching steel at the range, running a .22LR trainer build, or just want to shed unnecessary weight without sacrificing accuracy, this 6" barrel upgrade replaces your factory upper in minutes—no gunsmith required. At 9.5 ounces, the Pac-Lite IV's aluminum construction and stainless steel breech face deliver the balance and point-ability that turns casual plinking into precision work.
Tactical Solutions engineered the Pac-Lite IV to run reliably with both standard Mark IV frames and 22/45 variants. The 1:16" twist rate stabilizes .22LR bullets across the velocity spectrum, while the 11-degree target crown and 5/16 x 28 threads (with included protector cap) set you up for optics, suppressors, or clean iron sight shooting. Pre-drilled and tapped for Pac-Lite scope bases means mounting glass is straightforward—the whole package drops together like factory spec, but with the handling characteristics of a rifle half its weight.
The OD Green finish blends tactical aesthetics with that utilitarian look that works in the field, at the bench, or on the competition line. If you've been living with a heavy factory Mark IV upper, you'll feel the difference the moment you shoulder this upgrade. It's the kind of bolt-on improvement that makes your .22LR feel like a grown-up rifle.
| Caliber | .22LR |
| Barrel Length | 6" |
| Weight | 9.5 oz |
| Twist Rate | 1:16" |
| Thread Pattern | 5/16 x 28 |
| Crown Style | 11-degree target crown |
| Finish | OD Green |
| Included Accessories | Thread protector (end cap) |
Yes. The Pac-Lite IV upper assembly is designed to drop onto existing Ruger Mark IV and Mark IV 22/45 frames without modification. Installation requires no gunsmith.
The barrel and receiver are pre-drilled and tapped for Pac-Lite scope bases, which are sold separately. It ships with a thread protector (end cap) for the muzzle.
The Pac-Lite IV features a 5/16 x 28 thread pattern, standard for .22LR rimfire platforms.
The Pac-Lite IV weighs 9.5 ounces. Specific factory upper weights vary, but the aluminum construction and optimized design philosophy result in a noticeably lighter, better-balanced rifle compared to standard factory assemblies.
