In the Nov/Dec/, 1980 issue of, "American Handgunner," I published an article on the MKI, that being the form then made.
Curious to see how well one would endure, I asked Ruger and sources in Europe and in South Africa how long guns had lasted in their experience. At that time, South Africa was under a UN arms embargo, but guns did get through. However,some were shot more than usual, because some people had trouble getting new ones, and clubs owned guns that were used by members before buying their own. In Europe, club guns also got enormous amounts of shooting. Some had fired hundreds of thousands of rounds. One fellow quipped that they were "cleaned occasionally, if someone feels moved to do so." Yet, they worked.
Ruger's then-Export Director, the late Steve Vogel, told me that he knew of Ruger Standard and Mk. I autos that had fired astonishing amounts of ammunition, and were still in use. I believe he said that one gun in Europe had fired a full million rounds! (He didn't say if it had ever had small parts replaced.)
I don't shoot my own MK II nearly enough to worry about it.
Lone Star