Quote Originally Posted by Bob Seijasicon View Post
The issue is not whether the pin is in place, it's whether it shows signs of having been removed or replaced. That is a strong sign of originality, you can't rebarrel a receiver without taking it off. The best telltale is undisturbed original staking.
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Interesting, thank you!

In this regard, if the pin is missing but there are no signs that it was removed, does this mean anything?

Is it possible that they could just fall out on their own?