cheaper here.
http://forums.airsoftmechanics.com/i...hp?topic=439.0
I fit mine between the MB and the battery. The metal stock adapter has plenty of room especially if you take off the plastic cup at the end of the MB. You can also fit it in the rear stock. Let them know that you want extra long battery leads or you might have to wire your battery in reverse. Most retailer think M4 when you say ver2.
good luck