common things to look out for when buying a sbt

[Bob Kuczynski]

ok lets run with this.....

if you wanted a sbt to well...shoot trap, why is originality important?
now of course, if the stock is a 12" lop and someone etched his name in it, I can see how a collector would go insane, but if a sbt is a sbt, what would be some specific issues to look for...where resale becomes a moot point?
its been my observation you find honest people selling them at a low market to match the low quality or non-originality. and sometimes you find those who jack them because they don't know any better.
point? if its been restocked but done well, no issue. if the wood was replaced, but is high grade? ok.
im more interested in say trigger types, common aftermarket things, mismatched parts, screws, wrong blueing, etc etc...
what seems to be the most common things people who buy them change out to make a little better, once they have them for a while and realize a little tweek would make it perform that much nicer??
and being these guns are older, what are the things that break most often?