The SN is two digits with no suffix so its definitely a early 1940. I have most of the metal parts. I have a bayonet lug that mismatched and the front band is milled and unmarked. I've been looking at the book Backbone of the Wehrmacht by Richard D Law because I have a S/42G receiver I want to rebuild too. But this rifle has "k" codes instead of waffenampts. It has a duv barrel which will be replace by the S/42G barrel I found, but that's another project.