Yes, definitely an Austrian Republic Conversion (HV Heeres Verwaltung), of 1936.

And since the Bolt is not EP'd, probably never went to Bulgaria, but remained in Austriaicon/Ostmark during the war, or Probably travelled with Luftwaffe AA units ( common rifle in these units); and the original M95 pattern sling is a plus ( at least, pre-WW II pattern).

Nice find.
Doc AV