The internals of the KWA KM4 KR12 AEG Airsoft Rifle are factory upgraded with a reinforced box, hardened steel gears, high tension spring, high density piston, and Hi-torque/ Hi-speed motor. The rifle is equipped with a KWA 120 round mid-capacity magazine.
You'll find the battery compartment located inside the crane stock of the rifle. To remove it, pinch the two tabs located directly underneath the stock plate and remove the plate. Slide the cells into the appropriate tubes making sure that the wires are in the correct direction and not caught in any pinch points. Once you have them in position, close it up and get ready for action.
This gun is engineered specifically for the Lithium Polymer (LiPo) batteries and offers higher capacity and superior performance than the NiMh battery powered guns. But - this powerful battery requires internal components of the highest quality. To compensate for the extreme power of this advanced battery, the rifle features a reinforced metal gearbox that uses KWA's case hardened, precision metal gear sets. A heavy duty spring and high-torque motor are incorporated for superior results.