Thread: Ruger magazine
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Old November 03, 2018, 19:13   #5
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From the Ruger forum. They say 1970.

Both the RST and the MarkI used the A54 grip frame (not so marked but called such on the schematic) until about 1970 when Ruger changed the magazine button to the other side and stamped the grip frame "A100" for both fixed and adjustable sight pistols.
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