I think Hectic read it as handguard instead of foregrip. :P
I'm pretty sure the vertical foregrip battery storage you are seeing right now is mainly homebrew. As far as I know, the first commercial vertical foregrip capable of holding an AEG battery would be the PTS EPF coming out soon (or so they say). However, this would only be able to hold a LiPo, so no NiMH if that's what you run.
I don't know why anybody would homebrew a vertical foregrip battery storage though... Why not just use a PEQ box or a MOE handguard or rearwire?
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