this double HFC134 gas tank carrying on the wrist was in Asian market 30 years ago. The last tank is full new tank and the second is an empty can, for letting liquid gas turns in to gas form, then supply power to weapon. At that time there was no blow back almost, but just using simple mechanism design to make semi/full auto shooting. That's so good of Japanese engineering.
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Originally Posted by R.I.T.Z
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