There are a number of possibilities,but I wonder..
The 799 is a mini-mauser with an extractor that is not the conventional mauser extrctor.Maybe it acts like a push feed and easily snaps over a rim,but some extrctors,like mausers and 1911's,don't work that way.Some must be fed up from the magazine,so the cartridge feeds under the extractor.Forcing the extractor in those firearms is brutal,and likely to damage the extractor.
I can't say for sure,but try putting the round in the mag,even to just shoot one.If that goes easy,everything is as it should be.
Also,I don't know,does it have a plunger ejector? Sometimes when a product has a hole drilled in it,not all the drill chips get cleared out of the hole before assembly.If a plunger ejector does get bound up,it would hold things open.
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