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im pretty sure you can't get 7.4v only 7.2v but you "can" with a stock (TM mp5 i assume) mp5 i believe, but trust me its better to have 8.4v to power the gun better. I'm not completely pro with batteries so someone else might have some more info.
But read the FAQ they talk about batteries in there. But overall why not just get 8.4v and remove the doubt?
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