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

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Why do Russian and Chinese tanks, e.g. the Russian T-90, have their main gun's base covered with cloth? - Quora

Why do Russian tanks have barrels on the back? - Quora

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

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

What was the purpose of the blanket-like material mounted at the bottom end of a barrel on a battleship turret? - Quora

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What was the purpose of the cloth wrapped around a tank barrel? - Quora

What is that on the end of the tank barrel? - Quora