Use the search function on this site, you will see some dramatic script and clean results.
I’d start just by giving it a gentle washing with spic and span on the wood.
You really are trying to clean the barrels just like you would a normal shotgun, to identify if there’s any substantial pitting or anything inside the tube. That would render them unsafe to use. If after a typical shotgun barrel cleaning,they look nice inside, having somebody check the wall thickness, and you’ll be good to go with appropriate loads.
No power tools.
