There are people that will nit pick the process, and truthfully IDC. Flues are common, stocks broken through the web even more so. A blank to try with is about $60.00
An armload of chisels, files, and scrapers is bout another $25
It's not the tools as much as it's the hands and eyes.
I hope that Ernie? The accomplished UK stocker and all around good fellow, will see this and bail us out when the water gets deep

This is all for fun on a $100.00 skeet gun I've got laying around.
When I get home tomorrow, I'll try to take one apart and show where the problems always are.