(The M61 Vulcan 20mm gun itself needs the circus 
tent.
You could be a twiggy midget.
That thing won’t tuck into Speedo, or so she says.)
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If you talk to the gun manufacturers … It is not the length of the barrel but the size of the bore … Gurth like giving birth …
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Yes Sir: 20mm is a big bore ballistic, the Phalanx / Vulcan designed a lot of them coordinated to deliver a hale-storm / maelstrom effect.
That’s a serious damage delivery system.
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