A few details about that rifle. It's a M1930 FN Mauser built, most likely, in 1938 based on the serial and lower case "de". I can't say if it is Chinese contract or not, I don't see markings on the left side of the front ring, and that would tell you who it was made for. There should be a star over a letter there for Chinese contract, if I remember right. The stock would have a big star stamped on the side of the butt as well with numbers around it. The markings that say China were made recently, and it's hard to tell what else they say. Maybe importer markings.
The bolt and safety are not original to it. They would have matching numbers on them, or at least matching the last two digits. Not unusual, but it does kill collector value. I would suspect an arsenal rework, or just a parts gun someone put together. I'd guess the stock markings don't match the original either. The bottom metal should also have a serial number, it may or may not match.
Is it a workable action? Yes, but not as it sits. It would need to be surface ground to clean up the rust pitting (which isn't bad), and after all clean up work was done, it and the bolt would need to go to Blanchard Metal Processing to be re-case hardened. The action lugs would also need to be checked for set back and cleaned up if needed. Then it would be back to spec and usuable for high pressure cartridges. You'd have $500+ in it to get it to workable condition. Less if you can do the work plus $125 + shipping for heat treat. The heat treat on this one is non-negotiable.
Honestly, as it sits, I WOULD NOT SHOOT IT. No idea if it headspaces, and no idea what bore it has. You really don't even know what cartridge it is chambered in. 7.9MM could be three different actual sizes. China got 7.92X57, others got different sizes. It needs a few checks. First, I would slug the bore to find out the diameter. Next, would be a chamber cast to see what it is chambered in (100 years is a long time), last I would check the headspace.
I have done a lot of Mauser conversions, and they are fun. But, they can be a money pit if you don't choose your action with some knowledge.
Jeremy