Another question is what size socket is required to take off the buttstock? I tried all I have and it doesn't seem to grab on. Does it take a special tool?
I've worked on a few of these and IIRC all of them had a standard slotted screw holding the buttstock. However, if there's one thing constant about Savage/Stevens combo guns is that every one of them is a little bit different and who knows if somebody got a long bolt at some point and used it. I'd get a nice bright flashlight and take a look.
I usually use a 3/8" drive socket with a large screwdriver point and a LONG extension. The socket fits the hole, keeps the bit centered and there's plenty of torque with the ratchet handle.