This is a minor detail but I think the 340 had a conventional ball

The earlier model 325 had the Mannlicher type handle.

>>>>Gibbs Steyr 1893 6.5X53R<<<<<<

Does your rifle have an ejector set up like a Mannlicher Schoenauer? If so an 1895 Dutch Steyer bolt will work.

If your ejector is in the bottom of the receiver behind the magazine housing you have the 1892 Romanian design.