I just became the owner of this 12 ga. shotty. It is in pristine condition, hard to tell from a brand new gun. This is my first shotgun and I feel silly because I know nothing about them. I traded even for my old Russian M44 Mosin Nagant. Please tell me about this gun, and how do I find out how old it is? The serial # is H463XXX. Can the barrel be shortened for a nice HD weapon? I only had $115 in my old M44 so I think I made a good deal.