Gast gun
Gast gun is a machine gun or multiple-barrel firearm.
Overview
German twin barrelled machine gun.
In detail
It is associated with German Empire.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Gast gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4420900: Gast gun
Consult the source