I don't have anything really "rare" but the closest thing I have would probably be this Ithaca M-49, single shot 22 rifle. I don't know how many they made, but I don't see them too often on the rack.
It's a single shot 22 as I said, the magazine tube is fake. The lever operates a drop block action for loading, the hammer is manually cocked, then the lever ejects the spent case after firing. Very cool little gun. I wanted one when I was a kid and never got it. When I saw this one, I jumped on it.
The only other thing I've got that's sort of rare I suppose is a Thompson/Center .36 Cal. "Seneca" muzzle-loader. I've never fired it. I only think it's rare because most everytime I post a picture someone offers to buy it.
