EJ - I would only send a gun for re-proof if it was legally required because it was no longer in proof.
Homelseejoe - Now you have it right, there is no legal minimum wall thickness.
Also, I have not seen or heard of fake proof marks appearing here(UK)in recent times.
My own opinion for what it is worth:
I would not sell a gun to anyone with a barrel minimum thickness of less thanabout 15 thou (it would have to be way down the barrel).This is just for my peace of mind.
The thing is you need to tell the buyer what he is buying. Sell a chap a Holland with a spot at 16 thou in one barrel in a place it won't be a problem and sell it for the right price, he will be happy if fully aware of what the score is.
The same gun with 28 thou in both barrels would cost him twice the cash. Sell him the thin barrelled gun for top money and let him think that he has an A1 gun? I would not do it but there is nothing illegal in so doing - the buyer should either know what he is doing or take expert third party advice before paying up.
I have seen guns pass proof with spots down to SEVEN thou towards the muzzles. I have also seen them blow spectacularly!
