problem fixed, please delete, thx cgn

I haven't checked just now....but I'm sure the breech block pin in mine is a double pin.....inner and outer? Might depend on year of manufacture!!! Don't know for sure, but the inner pin forces the outer to expand and lock in place..
 
When the pin starts walking, is it even amounts on both sides or just one side (you'll have to remove the extractor if you have a long extractor)? If just one side, it is possible that the roll pin has snapped and the loose end is working its way out. If it was removed by the prior owner, chances are they reused the same roll pin. Roll pins shouldn't be reused once they are removed.

Easiest solution, to be safe, order a replacement roll pin and replace the current one. If you have the long extractor, best order a replacement roll pin for that as well since you'll have to remove it to get to the roll pin.

Edit: Had a look at my roll pin. It does look like a pin in pin but it's actually one pin, just made like a swiss roll. :p
 
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It's a pretty simple job if your have the proper sized roll pin punch and a hammer. It is possible the pin sheared/broke and the gun wasn't tampered with.
 
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