Don't know what to tell you. I've had a number of them and not those problems. Name names. Did you contact the companies?
"a number of Them" and have I contacted the companies?
By "them" I assume you mean the Used guns?
By "companies" do you mean the manufacturers or the Seller of the used guns?
Clearly I would not contact the manufacturer as the item was sold 'used' by a third party.
Item #1; no I did not track down the seller from the gun show - I purchased "Used" knowing some work may be required, just turned out to be more then I expected.
For item #2; Yes, I returned to the 'antique gun' shop but got no where with them. I won't go into all the back-and-forth we exchanged.
Bottom line is; Buying 'Used' is always a 'Buyer Beware' venture.
I learned the hard way not to take Exterior looks and 'feels' for granted. Unless they allow you to Break It Down Completely before buying; walk away.
'Beware the mechanic that packs the transmission with sawdust '.
My experience with buying production guns New has been uneventful; satisfied with all I have purchased. However Pedersoli and even some India makes from Loyalist Arms cost more then $600.
Oh, but I have 'inherited' a couple 'used' and no problem there other then minor repairs - but 'inherited', the price was right