In Vietnam, condoms were issued for that very purpose. They fitted easily over the birdcage flash hider of the M16 and could be secured with tape or string.
I have taped my rifles for many years, about 6" of tape down the side of the barrel and the last inch stuck over the muzzle. Often the column of air ahead of the bullet will flip the tape open. Having the long piece down the side means there is always more if you shoot the end off. Very handy in Westland and Fiordland.
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