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

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

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

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

Why do tanks raise the barrel after firing? - Quora

Why does the Su-122's gun mauntlet look like it's on the outside of the tank? - Quora

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

Why does the Su-122's gun mauntlet look like it's on the outside of the tank? - Quora

Wine barrel and stainless steel tank cleaning