I have a shotgun that was handed down for a few generations and when I last used it the 12gage shell did not get ejected; seems to have gotten stuck on the inside of the ejector on the left barrel. I would like to get this fixed, but need to identify the model so I can then hunt down a place to get some advice in repairing. I suspect it is a Springfield 99E model (based on the serial number). Any help would be appreciated.

The link to my Google photo album share is:
https://photos.app.goo.gl/ZnHnE2nPqRaGEMFF8

Photos are as shown:
This is the shotgun with the barrel split.

https://photos.app.goo.gl/qQ4McNazkFqBWsqi8

This is the stampings on the top

https://photos.app.goo.gl/7qw3vgVGuoAnxsgB8

Image of the side showing Springfield.

https://photos.app.goo.gl/uJbHvb9L8VcfxUtV9

Here are some stamps on parts after breaking it down a bit. Apparently shows serial number.
https://photos.app.goo.gl/tr1YFyHksZiT9H7FA

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Welcome to SGW ! !

You appear to have a store-branded Stevens Model 311 SxS

AFAIK, they weren't issued with ejectors, only an extractor.

Not much can usually go wrong with the extractor, but yours may be bent or worn and need replacement - which is a "drop-in" (not usually needing fitting).

You mighty try Numrich Arms (google) to obtain an extractor, and either swap it out yourself or have a gunsmith do it
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No.

For 1929, the J. Stevens Arms Co. introduced a cheaper version of their Springfield Arms Co. (earlier Riverside Arms Co.) No. 315, and called it the Springfield No. 311 --



This gun and its fancier versions the Springfield No. 315 and the Stevens No. 330 used the G.S. Lewis Patent No. 1,136,247 style action using coil spring driven strikers rather than internal hammers rotating about an axle. J. Stevens Arms Co. made many thousands of these G.S. Lewis action guns under their own names and many, many "trade brands." Your gun was made 1938 or earlier. By 1939 the barrel markings included the chamber length --



The post WW-II Stevens Model 311 is a totally different gun.

So, this looks to be a 1938 or earlier, since the chamber length is not imprinted? Are the extractors exchangeable between the models then?

Looking at the extractor part numbers from several sources, it looks like the extractor is pretty much universal.

Part No. 11 from a 1934 J. Stevens Arms Co. parts catalog --



From my 1951 Savage/Stevens/Fox parts catalog the extractor is part number is 315-747.