Hello, I am new here and though I am knowledgeable regarding German Auto Handguns, but I confess I know little about K98k rifles. So I have this 243 1940. It does not have the stock with a disc for bolt disassembly, but rather the stock with a hole in the butt plate for bolt disassembly. The stock is not marked or serial numbered. So I figure this is a replacement stock? and what period was this stock correct for? Any other observations appreciated. Blue is pretty thin. It is a shooter for sure. Thanks for your help, Mark