From your post, I am assuming the casing is extracted, but not ejected from the gun.
If you can post a picture of the broken part, it would help.
The actual eject is done by the carrier lifting and the rear corner of the carrier is cut out
to clear the bolt. It does not eject until the action is fully to the rear, pushing the spent cartridge
up and out of the extractor.
It may just be a cleaning issue. Dirt not allowing the action to move fully to the rear.
) has the parts list
but is showing sold out of the part.
Hope this helps.