I saw this gun demonstrated at Ft Bragg in 1971 at a symposium for new developments for Viet Nam. Another interesting item seen there was a silent M79 grenade launcher, or actually a silent round for the M79. It used a cartridge case with an accordion folded part of the case that contained all the propellant gasses when fired. I had already done my tour in VN, so don't know if either was ever used.

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Tom
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