The TACSOL Pac-Lite IV upgrade is a replacement upper designed for Ruger Mark IV and Mark IV 22/45 frames. It is intended to reduce weight, improve balance and accuracy, and increase reliability while remaining user-installable without a gunsmith. Available finishes include Gun Metal Gray, Matte Black, and Matte Olive Drab.
Key Specifications
- Designed to replace factory Ruger Mark IV and Mark IV 22/45 uppers.
- The barrel measures 4.5 inches for balanced handling.
- The unit weight is 8.5 oz.
- Rate of twist is 1:16.
- Muzzle threading is 1/2-28 for compatible accessories.
- Features an 11 degree target crown for consistent bullet release.
- The breech face is finished in stainless steel.
- The barrel is constructed of lightweight aluminum.
- The barrel is drilled and tapped for Pac-Lite scope bases.
- A thread protector (end cap) is included with the barrel.
The Pac-Lite IV provides a lightweight, accuracy-focused upgrade path for shooters who use their Ruger MKIV platforms for rimfire target work, training, and recreational range use. Its drilled-and-tapped configuration and target crown make it well suited to adding optics and refining shot placement, while the included thread protector keeps the muzzle threads protected when not in use.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
