 The MK II was removed from production in 2004, when it was replaced by the MK III.All Ruger rimfire pistols are chambered in .22 Long Rifle only.Some special variants that command higher prices are the Government Target Model, a model that was used for pistol training and competition by the United States Army, and the Red Eagle models, which were made from 1949 to the year of company co-founder Alexander Sturm's death, in 1951.