that pitting is likely nothing to worry about what does the inside chamber worry about? a lot of those rifles saw some very wet service and storage. I have a 1941 longbranch with pitting like that on the places the wood touched the stock. inside bore is just fine (for it's age) and it shoots to a serviceable standard. The pitting looks super deep, and first thought is naturally worrisome...but in context it's entirely cosmetic. I asked the same question of mine when I was cleaning it up. I posted with pictures around here somewhere.