Manuals are available at the Ruger website. However, if you've never taken this pistol apart before, I would very strongly suggest you take it a gunsmith and have them show you how to disassemble and reassemble it. Many people find the Ruger Mk. I, II, and III pistols a bit complicated, and the best way to learn is to actually be there, hands on, with someone who knows how.
Chat with our AI personalities