just picked up a mossy 500 from a friend at work. I kinda feel bad, he only asked 80 bucks for it. Not in too bad a shape for a used one, has a few blemishes. It'll make a good small game/turkey gun i think.
I bought one in fixed choke, no rib, 20 ga close to 30 years ago and it was pretty beat up then and I haven't done anything to improve it. I have used it for varmints and pests and it still works just fine. $80 is a decent price for a barrel much less a decent pump shotgun. Good deal.