Dugaboy,
I was just trying to say that if Demi-blok is the correct spelling in German, the expression comes straight from the French and/or Belgian "demi-bloc".For instance, I do not believe that "Demi" means anything in German. And yes, it is the same as chopper-lump.
I guess I should use more

around my text as the post was not supposed to be hostile in any way.
Maybe I should have used "original" instead of "proper".

By the way, I was wondering when the first chopper lump barrel was built and by whom. I know that there are a few Damascus chopper lumps around...
WC