The Mark IV 22/45 Lite's CNC-machined aluminum receiver houses a 4.4” stainless-steel barrel, held in place by a tension nut to ensure accuracy.

Ruger Mark IV Tactical: Classic Meets Modern In a nutshell, the Ruger Mark IV Tactical is a heavy-barreled Mark IV with a threaded muzzle and accessory rails attached to it. The Mark IV has quite a ...

Ruger recently discovered that all Mark IV pistols (including 22/45 models) manufactured prior to June 1, 2017, have the potential to discharge unintentionally if the safety is not utilized correctly.