GC_UPC Tactical Solutions Pac-Lite .22 LR 4.5" Barrel for Ruger Mark I, II, III and 22/45 $266.99 PL4.5TERF-02 show more like this 9.99 GrabAGun.com GC_UPC The Tactical Solutions Pac-Lite upper for the Ruger MK I, II, III and original 22/45 models (does not fit MK IV or MK IV 22/45) is a great way to improve the balance and accuracy of your pistol. Built from a solid piece of aircraft aluminum with a steel MAP PL4.5TERF-02 show more like this Free on Guns, $9.99 Accessories, $14.99 Ammo Tombstone Tactical GC_UPC Tactical Solutions Ruger Mark/22/45 Fluted Barrel - Matte Black - 4.5" $289.00 PL45TEMBRF show more like this Calculated in Cart Primary Arms GC_UPC Tactical Solutions Pac-Lite 4.5" Threaded/Fluted Barrel .22 Long Rifle Ruger 22/45 and Ruger Mark Series Pistols Matte Black Finish $374.04 PL4.5TERF-02 show more like this $10 Flat for Firearms Cheaper Than Dirt