Why is there on some tanks cloth at the base of the barrel

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What is that 'lump' in the middle of the main gun's barrel on many tanks? - Quora

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Why do some tanks have fabric covering their mantlet, like the Centurion and T-54/55? - Quora

White cotton like stuff in fish tank

Why is there on some tanks cloth at the base of the barrel (thinking comet specifically)? - Quora

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