Hmm....You sure they didn't just give you a shite Gen 1 in a Gen 2 Receiver? Nah, just joking 😁but.....
The low FPS isn't that bad although it's the opposite to what I typically hear about those with Gen 2's. Usually the AEG is firing too hot for CQB venues and they have to replace the spring. So the FPS being low is actually a good thing and as you said; may be the result of altering from the vendor in this instance.
Personally, I have only ever heard 11.1vs as recommendations but this could be another suggestion for maintenance and longevity. I'd still use a 11.1v though.
Btw Is there a button on top of the RIS rail because If there isn't, you got yourself a Gen 1.😐
And thanks for the referral for magazines gonna need that!
Umarex/Vfc Mp7a1 V2 Battery
in Electric Guns
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What's the button for on mp7 top picatinny