The action area, but leaving the bottom alone. In other words where the action bolts/screws come up from the bottom. So, just a little on the sides. You can use a wood dowel wrapped in course sand paper, and go slow. You're not trying to remove much, maybe .010 to .015 ". The barrel channel can also be relieved this way with the proper size dowel. This is assuming you don't have the proper had tools for inletting stocks by hand, or a mill. This is the cheap, and easy way that works as long as you take your time to get where you're going.