I did some Googelig after I posted the pictures, and found two sites with some good information. Sorry for beeing a little lazy..
(
http://ltgoodlife.com/features/JohnG/1/GEHA.htm and
http://p102.ezboard.com/fparallaxscu...icID=291.topic )
I thought it was a ww1 rifle converted somewhere in the 40-50s, but instead it turnes out to be converted sometime between the wars by a company called Remo.
Some say it's safe to use, others not.. So at this point I will not try to shoot with it.
However, I found nothing about on the 'D.R.P.A' marking and I think it is strange that is has so few ww1 markings