Does anyone know where to find a replacement barrel for one??
My dad has an original barrel with a full choke and doesn't want to wreck it, please help!

You could buy a new gun cheaper than you could get a new barrel put on a '97. I would suggest a 870 Exp. you can get one for around $200.00 new after rebate.

neither of us have an FAC[>:]

The '97 requires a gunsmith to fit a new barrel to the gun. It's not a gun that you can just buy a barrel and swap out. Shoot Kent Impact T/M in it if the gun is serviceable. Shoots just like lead.