Private Caboose Airsoft put together airsoft gunn powered that uses the Valken Airsoft V12 Engine Electro-Pneumatic Gearbox Kit for the Version 2 Gearbox. This is a drop-in HPA kit to turn your AEG into being an HPA-powered airsoft gun. Other parts are from APS and Valken and he takes it out for a game to see how it performs.