All the gun shows I've been to had guns for sale that you could buy cheaper from actual dealer. I wont say if you find a deal too good to be true it probably is too good to be true... But, there is always a chance it's stolen or something like that. If I was in the situation, I'd try to get it checked before I bought it. If it's not stolen why would the guy selling the gun really care?

Just my 2 cents.