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I would guess that it COULD be some kind of sub-caliber training device, but the few of those that I have seen were usually mounted ON the barrel (and there doesn't seem to be a way to do that with this gun.) The ones that go in the chamber or bore were usually rifle caliber, and had flanges of about the bore size so that when the device was fired it would not strike the side of the bore. I don't see a reason to use a repeater in training either, since the crew would be doing the full exercise of the firing cycle. They would simply reach into the chamber and cycle the action of the sub-cal instead of inserting a shell.
It looks like there are some kind of possible block mounts on the frame below the front of the cylinder, and about where the rear sight would be.
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