There are a few guns in my collection that stand above the other in price to fun ratio. For me, that gun is the mosin nagant. For $200 you can buy a gun and a few hundred rounds of ammunition. I can't explain why, I have other, more accurate, more advanced guns but the mosin is still one of the funnest.
Right behind that would be a single action .22 revolver or Ruger Mark II.
So, my question for you. What gun of yours has the best price to fun ratio?