The first viable example of the Gast Gun appeared in mid-1917 and development spanned into early 1918 when official testing was begun. The tests overwhelmed German authorities who optimistically called for several thousand examples from a first-batch. This continued into late in the year though, by mid-November, the war was over and German found itself on the losing side. It was only in the post-war period that the gun was even made known to the Allies (kept under wraps by Germany until 1921) who promptly snatched up samples and tested it at length in their respective countries. The machine guns were found to be excellent weapons in terms of reliability, durability, and function despite the many moving parts. However, the post-war drawdown worked against this rather novel and expensive design which did little to improve upon tried-and-proven machine guns already in vast circulation.
As such, no one world power pushed to adopt the system and it ultimately fell to history. The Gast concept did live on a time longer, however, when it influenced the Soviet GSh-23L automatic cannon for installation in fighting aircraft.
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