The Mark I, II, III, and IV pistols are some of the most accurate and reliable pistols you'll ever find. The newest one, the Mark IV, fixes the irritating problem of trying to put the pistol back together when you take it apart for a good cleaning. I bought a Mark I in 1982 and fired thousands of rounds through it. Eventually the recoil spring keeper broke. I got a new one from Ruger in about 3 days. I also have the III and IV and the quality has remained excellent over the years. You will never regret buying a pistol in this series.