A fellow is trying to sell me a Remington rolling block in what appears to be the .43 Egyptian caliber. It's in very good condition with no cracks in the wood but a pretty worn bore as I'd expect. Any ideas what the current market value is on these? He want's $600.00 cash which I would think is way too high, but I haven't seen any sell lately to know the true value. It's the full length rifle, not a carbine.