Replace P08 barrell

[Vlim]

Our forthcoming book will include a detailed overview of the steel types used in the production of the Swiss Parabellum, the late 1930s Mauser P08 and the post war Mauser Parabellum.

So I'm not going to give away too much at this point, but I can say that the late 1930s Mausers used a 36 Cr Ni Mo 4 steel type.