Pump-action shotgun mechanism.
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Previously:
https://www.homemadetools.net/forum/...986#post137710
https://www.homemadetools.net/forum/...700#post159496
https://www.homemadetools.net/forum/...835#post171223
https://www.homemadetools.net/forum/...399#post215331
https://www.homemadetools.net/forum/...125#post195468
