Im going to start on a single shot lower and I need help deciding what I should pair with it. I was going to do a 50 BMG upper but for pretty much the same and price I could get an Armalite AR50. So I started to think about what else I could do with it. I know that this build serves no practical purpose. This is just to make something different. -There is a crossbow upper that would be interesting (but at the same price as the 50 bmg upper) -There used to be single shot top break uppers for California but I think they got outlawed as well. -The AR15 guys in England make bolt action uppers since that is all the can own. I doubt I would get one imported into the US though anyone know of any wacky uppers out there that would be a good match for this lower?