Over the years, I have gotten into a (bad) habit of "saving" old firearms. I never used to think twice abut buying a gun with a broken or mssing part, as it seemed I could always find what I needed at the next gun show, or order it up from Numrich, Sarco, or their ilk.
Boy, are those days gone! You almost never see old gun parts vendors at shows anymore, & the big parts houses nowadays are mostly out of stock of anything really useful to repair a gun that is no longer in production, especially if the manufacturer is defunct. I'm not even talking really esoteric stuff here, either. Try to get parts for say, an Ithaca rifle or a High Standard pistol, even (maybe especially) the most common models. You're likely as not to be out of luck.
So now I have a bunch of orphans that may never go "bang" again, & it frustrates me as each one of those is a little bit of firearms history lost.