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Work on the ejector assembly of the 870 should be either sent to the factory, or to a gunsmith who has the special tooling, AND who knows how to to it.
Look on the outside of the receiver and you can see the two double-headed rivets that hold the assembly in place.
Do the change wrong, and the rivets have to be replaced and the receiver has to be re-blued so the rivets can be polished flush with the receiver.
It's sometimes possible, using the special tool to remove the spring and re-rivet it without having to refinish the receiver.
If an attempt is made to do the job without the tools, the rivets will protrude from the receiver and will have to be polished down flush, and the receiver re-finished.
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