Like its predecessors, the new Mark IV 22/45 Lite is a blowback-operated semi-automatic rimfire pistol that feeds from a removable single-stack 10-round magazine. Bill ... 4.3" long aluminum ...

The Mark III also had a magazine disconnect safety and an integral key lock system. Ruger changed ... 22/45 Mark III Lite shaved a half-pound of weight in 2010 by using a 4 3⁄8" barrel ...

45 ACP. The Ruger Mark IV 22/45 is the current base model of the pistol, and it might just make the standard-setting Ruger Mark IV better than ever. The current Ruger Mark IV 22/45 series includes the ...