Ex-military small ring Kar 98a actions were very popular after WW1 with the Suhl/Zella-Mehlis guntrade for building slim hunting rifles . These actions come from dismantled carbines, hidden away from the allied disarmament comissions. Usually all military markings were removed or covered up by engraving to make them bona-fide "civilian". As the Kar 98a trigger guard, different from the Gew98 one, was too small and in a wrong position for installing double set triggers, they were usually replaced with shotgun-style guards as on your rifles, even if a dst was not to be installed.
A photo of all markings on the underside of the barrel may point to where it was made and proofed, SSuhl or Z-M, and to the date of proof/making.