I have a Marlin A1 second variation, chrome bolt assembly. I am interested in locating the correct aperture rear sight. Can you determine which sight that would be from this description, or would it require measuring the center to center screw holes? Was the Marlin 12R sight issued in two sight base lengths? Looking to bring this one back into operation. It was my Father-in-Laws. Thank you for your consideration. ~ Donald P McGaffey, NRA Master Training Counselor, Redford, Michigan.
