DIY everything, bro.
I'd say go to airsoftGi.com and buy the parts there, I think you need a small battery pack but no gurantees. As for forward grip I'm sure they carry them too.
Seriously, just post in the Discussion thread instead of making a new topic.Get this.
Okay yeah, whatever. It doesn't matter, I answered his question anyways.
Combat Machine are G&Gs with plastic bodies. That means the internals are top-notch for a gun it's price. Hence my "boner" for them.