This is an amazing battery!! It bumped my stock Echo MP5 RIS up to at least 20-22 rps. It shoots so fast it's scary cuz it's shooting 420fps.
My one problem with it is that it is frigging HUGE.
It does not fit into the full stock of an MP5 or an M16. I actually have no idea what it will fit in. My plan is to duct tape it to the side of the stock. but that's just me.
Super high ROF
Lasts a really long time (3800mah)
Really too big to fit in anything
Rating: [4 of 5 Stars!]