What Are Those Bulges on Tank Gun Barrels? | Koala Explains: Bore Evacuators and Fume Extractors

The only consistency among the guns of armored fighting vehicles, is that none of them are consistent. Whether it's longer barrels, higher calibres, guns for different roles, they're all radically different... But early on on the Cold War, they all seemed to inherit one ubiquitous feature - that "bulge" part way up the barrel... What could that be, and should I see someone about it..?

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Видео What Are Those Bulges on Tank Gun Barrels? | Koala Explains: Bore Evacuators and Fume Extractors канала Armor Cast