I'm not exactly sure what is meant by "proven." But a part of that must mean effective longevity. Personally, my top two choices would be the Colt 1911 .45 acp (and all of the clones) and the Colt single action army in .45lc (and the Ruger Blackhawk). Coming in a close third would be the Smith & Wesson DA revolver. I'm guessing that in 50 years, Glock may also be on this list.
chuck
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