I am starting my first build. A stock that is about 20 years old was given to me. I am beginning to inlet the barrel and have notice that the stock has a bow in it, both front to rear and a slight bite to the right, looking from the rear. I started widening the barrel channel tonight, and have noticed that the top edges is getting a space between the barrel flats and the sides are not yet down touching the bottom. I am using an octogon barrel inletting tool for the 13/16 barrel. My question is what is acceptable as far as a space at the top of the stock and the side of the barrel. Since this is so old, I may just have to get a new stock that is good and straight to start with. Any suggestions?