The Tactical Solutions Tacsol Pac-lite Iv Rug Mkiv 22lr 4.5 Odg upgrade replaces your factory Ruger Mark IV or Mark IV 22/45 upper to shed weight while boosting accuracy and reliability, making it an ideal enhancement for precision shooting and everyday plinking alike. This upgrade is offered in 4.5 and 6 barrel lengths and ships in Gun Metal Gray, Matte Black, or Matte Olive Drab to suit your finish preference, with a compact 8.5 oz profile and a 4.5 inch length that preserves balance for feel and control. It features a 1:16 rate of twist, x28 threads, and an 11 degree target crown, paired with a stainless steel breech face and receiver, and a lightweight aluminum barrel and receiver to maximize rigidity without adding bulk. The Pac-lite upgrade is drilled and tapped for Pac-Lite scope bases, and a thread protector end cap is included with the barrel, ensuring a clean, protected installation. Installation on your existing MK frame is a cinch and does not require a gunsmith, delivering improved balance and accuracy that lets shooters feel like a pro, while maintaining reliable operation under a variety of field and range conditions.