ozyclint
WKR
I'm sure if you asked around on the Primitive archer forum that a knapper there would be able to sort you out for flints.I'm sure you will.
What's the timeline on having your gun ready to shoot? Hopefully you have a source for flints. They've disappeared in the last 6 months and are only occasionally available in smaller quantities. I think the only ones available now for the most part are the more roughly shaped ones often called 18th century style flints