Joseph, I’ve purchased and disassembled 14 pre 64 94’s over the past few years and have found that most haven’t been “Properly” cleaned sense new. The firing pins were ceased in about half because of 60+ years of old oil, dust,bellybutton lint and dead skin that finds its way into Everything. 

Try to NOT sand the stock and forearm. First, remove both and use a good stripper and a plastic scrapper (I used old credit cards) to remove old finish. Oil the stock with a premium wood oil (Not Tru Oil) and rub it in, several times. The little nicks and scrapes sometimes adds to the natural patina and use of the 94. They were purchased as tools and not to collect. Hopefully yours is Black Walnut, No stain necessary. 

I spend an hour and about 10 toothpicks cleaning the slots of the screws and around the heads before touching them with the Proper screwdriver (Hollow ground Only) with just a few proper tools and patience they come apart pretty easy. John Browning was a Genius!! I would have to say that unless someone along the line has done something stupid, you will not have to replace any internals. Hopefully yours has not had a butcher touch the screws with their “Universal” (one size fits all) screwdriver. You can purchase new pre 64 screws at Homestead parts. I’ve attached a photo of 4 that have been stripped and oiled without sanding.