40mm grenade volley gun from 1969.
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Previously:
https://www.homemadetools.net/forum/...290#post181080
https://www.homemadetools.net/forum/...284#post169311
https://www.homemadetools.net/forum/...578#post151556
https://www.homemadetools.net/forum/...632#post201479
https://www.homemadetools.net/forum/...647#post201541
