I need new wiring/mosfet

[Falcon7]

Model is JG Sr-25, tiny a** wire broke off the mosfet. Whole thing is kaput. I need to know where to get new parts(preferably without the precarious wiring) and how to install them properly. I don't need a fancy burst fire mosfet, just a regular one. Thanks in advance.

EDIT- This is the original setup: http://www.airsoftpost.com/product_info.php?manufacturers_id=20&products_id=31253

If I get that it will probably just break again in the same way. I would like something similar, but better. Or a way to replace that wire with a hardier one.