The M79 'Bloop Tube' was a post-WWII development intended to provide infantry with a portable, accurate grenade launcher, replacing the bazooka. Its core innovation was the 40x46mm low-pressure system, adapted from German Rheinmetall High-Low pressure technology, enabling a lightweight design. Despite its success in Vietnam, its single-shot nature led to the development of under-barrel launchers like the M203.
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