Mauser MK 30 mm Model F autocannon.
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Previously:
https://www.homemadetools.net/forum/...261#post176919
https://www.homemadetools.net/forum/...562#post170269
https://www.homemadetools.net/forum/...436#post150979
https://www.homemadetools.net/forum/...374#post150738
https://www.homemadetools.net/forum/...209#post161292