This Ruger manufactured bolt stop pin pivot is for the Mark I semi-auto pistol and is in very good condition with light wear. (file photo)
Measures: .124" x .309" +/-
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
