The MagPul PTS CTR Battery Stock is a special 6 position MagPul stock with cheek riser that cleverly conceals the included battery. The top of the CTR Stock, and buffer tube, has been left open to make room for the battery and wires. This kit comes complete with everything required to install to an M4/M16; the stock wires with connectors and heat shrink, the buffer tube spacer, and the stock retention screw and half washer to run the wires through the buffer tube. The cheek riser sits high enough to fit the included Intellect 9.6v 1600mAh NiMH battery. This is a great option to get 9.6v battery power out of your gun while keeping the realism with a concealed battery compartment.