1890s Burgess folding pump-action shotgun.
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7:19 source video:
https://www.youtube.com/watch?v=HXvmGtLYwKA
Previously:
https://www.homemadetools.net/forum/...700#post159496
https://www.homemadetools.net/forum/...5576#post82133
https://www.homemadetools.net/forum/...986#post137710
https://www.homemadetools.net/forum/...127#post125970
https://www.homemadetools.net/forum/...877#post105666