You mean a "New" gun? Nope. I guess I bought a new 54 fast twist/shallow groove "carbine" model from Cabelas and brought it back a week later, I just couldn't get it to shoot the things it wasn't made to shoot. It wasn't really a lemon,, just not my gig to shoot those modern projectiles.If you've ever bought a black powder gun that was a lemon
Otherwise I enjoy buying other folks "lemons",, the ones that they "just can't get to shoot right".
Usually it's a simple mater of actually cleaning the factory packing grease off the lock and trigger internals and giving them some fresh oil, and/or cleaning the bore of the carbon fouling left because they shot it without cleaning and there's that nasty tar caking in the bore.
(BoreButter fouling is very common)
You learn a few tricks along the way.
The bore is the biggest issue, if it's not a rusted mess, it can usually be salvaged.
Look for buggered up screw heads @ the lock plate and trigger mounts,, if their mashed-up, it means someone had a gorilla hand and they could have actually crushed the wood over-tightening. Minor bedding issues can be easily repaired with epoxy strengthening or adding wood/spacers.
Pipe wrench marks on the barrel/breach are common,, again,, look inside the barrel at the bore condition.
T/C's and Lyman/Investarms -- Traditions/CVA each have their own commonly ignored or typical error type issues. And most of them are, have been or can be addressed in the Gun Builders section of this forum.
The biggest deal,, look inside the bore - with a light,, a $2 bobber light dropped down there can tell ya a lot!