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The M79 grenade launcher is a single-shot, shoulder-fired, break-action grenade launcher that fires a 40x46mm grenade which used what the US Army called the High-Low Propulsion System to keep recoil forces low, and first appeared during the Vietnam War. Because of its distinctive report, it earned the nicknames of "Thumper", "Thump-Gun", "Bloop Tube" and "Blooper" among American soldiers; Australian units referred to it as the "Wombat Gun" It used 40mm grenade rounds.
M79 2

M97 GL