John,
I am holding a set of Savage tubes to shoot 410 in a 20 gauge and they look exactly like what you have shown us. You may be able to pull them out by the extractor. The best bet is to get a wooden dowel and run it down the muzzel and give it a push or a tap. Be sure to hold your hand at the breech to catch the insert. It is about 14" long.
Harry
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