The roll pin has always been a problem. Ya need a solid pin if yer gonna shoot that Gold Cup. Brownells has them for something like 99 cents or so. Or if ya got a machine shop near by , ask for a small piece of drill rod.
Normally, the roll pin just "drifts" out, from vibration. If you peen its ends, it will serve admirably. better peen the ends of the solid pin, too. The front sight is more of a problem. i've lost several of the same type, from .22 Colt conversion units. I'd always just silver solder them on and reblue the slide.
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