I have a magazine that I picked up for my MK4 out of a bin at a small shop a few years ago. The thumb button was on the wrong side, so I swapped it over. Then it went in the gun, but wouldn't latch. Well that's because there is no notch out of the side of it at the top. I did some research and I am not sure what gun this is supposed to fit. My guess is a MK1 but I'm not sure. I have swapped the thumb stud back over to the right side. It has the nice Ruger logo with the red background on the bottom. It does not have the lengthened 22/45 base plate. Please see the pictures and evaluate if this works for your needs. I would like to get $15 shipped out of it, as I have no need for it. Trades for common boolits, jacketed bullets, later MK magazines, or whatever else are welcome.
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