Guns like that have been around for about a century. They were designed for spies, assasins or resistance fighters. The Liberator pistol kind of falls in that category too. They were intended for close range use. Precission or fast deployment were not really required for that.
It may be a collectorīs item just like that Swiss revolver in caliber 2.34 mm.
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If it isnīt broken, it doesnīt have enough features yet.