I am looking into these kind of guns and I'd like to know about how much one will set you back. They are SKS, AK47, AR 15 (upper and lower seperately or whole thing at once, wichever is cheaper), and mosin nagant. I only really want to know about the base models of the gun, nothing really special. Also, if you could tell me wich one is best, I'll take those into account as well as the price.