It is a Drillinge Modell Selbstspannerdrilling System Modern. Possibly a Modell 2 within that subset:

Modell 2 in besserer Ausfhrung, automatisches Visier and Jagdstckgravierung.

It is a Roux action variant that somewhat resembles Meffert's Gewehr 3200 patented. I'd guess it to be pre-1912 but could we have a gander at the marks?

Kind Regards,

Raimey
rse