No one knew of its existence until the early 90s, when a Russian company put it into production for the public, so it's not surprising that James Bond never had to stare down its quadruple threat. The most unique aspect of the B-VI-307—besides having four smooth-bore barrels—is that it doesn't fire traditional bullets. It's actually designed to be used underwater, where regular ammunition doesn't have much accuracy or range. So, instead, it fires 4.5-inch steel darts that can accurately travel 50 to 65 feet.
Image by Dan Shea/Small Arms Defense Journal