The stones are meant to be used on the disassembled parts and as Hawg said, it's really is easy to take too much off. Start very slow, with smooth strokes made in one direction.
I’m shocked. Didn’t think it was legal to teach gunsmithing classes in a CA community college! Surprised the idiots in Sacramento don’t cut off some funding or something!
It’s a small world Gary; one of my brothers attended Lassen College, must have been in the late 80’s. Beautiful country up that way and I’ll be spending more time there when I retire.