The extractor, on the bolt, is what withdraws the shell from the chamber.
The part that expels the shell from the receiver is a separate part, the ejector, and is disfunctional either due to dirt/crud and/or broken parts - there's no "tightening" them, AFAIK.
A disassembly & inspection seems to be indicated - you might be able to get away with a thorough cleaning.
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