A friend asked if I was interested in a shotgun he never uses. He said it has only been fired twice in 15+ years. Could someone tell me what it's worth so I can let him know how much to ask?

Winchester Mdl 1200
12 Gauge
2 3/4
30 in barrel

Not much. IMO if it has winchokes, he'd be lucky to get $200 for it, and $125 is more like it if it doesn't have them. BTW they are not a prime example of Winchesters or shotguns, if you are buying it for personal use, and you hunt very much at all, I'd look for an 870, Nova, Model 12, 37, 31, or 500 before that one.