I know this is not a mauser but I thought someone here could help me out with info on a German made hammerless double rifle. It was made and stamped by a gunmaker named Max G. Fischer from Berlin. A regular 8x 57 round fits nicely into the chamber but can not be extracted because it requires a rim on the casing for the extractor to grip. I have to pry it out with my finger nail. The bore appears to be .318 diameter. It is set up for claw mounts but the mounts and rings are not with it any more. Anyone have any info or know where I can find info on the maker and the correct ammo? The caliber is not marked anywhere on the rifle. The rifle is definitely pre ww2 and maybe pre ww1. Good looking sleek little rifle.