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I on occasion saw an 870 that failed to eject properly.
In most cases it was either a damaged extractor or a fouled/rusty extractor spring and plunger.
Once in a while it was a broken ejector.
I'd recommend disassembling the extractor, spring and plunger from the bolt.
Use a small brush or a pipe cleaner and solvent to clean out the hole in the bolt, check the plunger and spring for fouling or rust, and the spring for loss of tension. New springs and plungers are cheap.
Check the extractor for wear, chips, or breaks.
Lube every thing and reassemble. Test for free movement of the extractor.
Visually inspect the ejector in the receiver to see if it's broken or chipped.
Last, inspect the chamber and give it a good scrub with a chamber brush and solvent. Often a fouled chamber causes poor extraction and ejection.
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