These? Were they released?
I think AGD decided to just go ahead with the normal battery pack and scrap the idea of making a smaller battery (mainly because downgrading in size wouldn't be able to power the solenoid well enough).The only thing I've seen similar to what you posted is kilaueakid's customized E-mag (see below) He made so it takes a foregrip and the battery goes in a pouch on his tank cover.
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