MC51: Getting the wires from the stock to the foregrip, HTF do I do that?

[Chubby]

Hey guys

Okay this is driving me nuts. The title says it all. I bought a TM MC51 from someone a little while back and they used to play with it with the battery in a pouch on the butt stock; which means the wiring comes right out the back of the gun. That's fine and dandy, if I was him, but I'm not and I've taken the lower receiver with the internals out and there doesn't appear to be any way to get the wires out through the front of the receiver and into the foregrip. I don't want to use a full stock and I really don't like the MP5K folding stock that was modified to fit the gun, that came with it.

Is there something I'm over looking? Do I have to buy a different kind of MC51that has an opening in the front of the receiver to let me pass the wiring through? It's been a royal pain in the ass because I can't figure out how to get it so I can store a battery in the foregrip and at the same time "you can even store your battery in the foregrip" is all over the internet, so that makes it just as frustrating.

Any help would be awesome, thanks.