i dont wana take away from the crane stocks elure, but i got a custom pack out of 4/5 a cells which i believe most of the crane stocks do. 2000mah NiMh 8.4v in a somewhat of a nunchuck configuration and took my fuse plate twised it 90 deg to the right and popped it in. Good to go. Yes it does make the gun front heavy a tidbit but work those muscles! I wana gona opt for the crane stock but i didnt like how it butted and all the other wiring and junk to deal with. If you get the crane stock you gotta get some real steel handguards to boot!