For M4 users who have highly modified gearboxes yet want to retain a collapsible M4 type stock without carrying the large battery externally in an unrealistic manner - then this Crane Stock capable of carrying a 9.6v battery is your best option on the market! Stock is fully functional and adjustable and hides the 8 1.2v cells necessary to power even the MOST powerful upgrades!

Note that installation and connection will require re-routing of the battery wire from the foregrip to the rear, and also require minor soldering to connect additional wire length(wire not included). Installation onto originally fixed stock M16 series rifles does not require re-routing of wires.