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This Ruger manufactured magazine latch is for the Mark I semi-auto rimfire pistol and is in very good condition with light wear. (file photo)
Note: Ruger Mark I semi-auto pistols with the following serial numbers have been observed with this part:
No Prefix: 127144, 129129, 166765, 210887 & 451514
10-90939
12-11122 & 12-72207
16-58723
17-33228