What are the best years should I be looking for? If I recall correctly 1950-1970s is a good range. I've seen a number of them around locally... So I am finally looking to pull the trigger so to speak. Also, how best to determine the age? I know a lot of barrels get swapped on Shotguns. So I am not sure the barrel code is a good indicator. Is there a better way to figure out an accurate age? What size barrel would I want to get for HD?