Polarstar Switchboard - V3 receiver so you need specific battery

so you need specific battery sizes to fit properly

We know that today's airsoft player demands performance from premium internals

Additionally

Gun includes QRS Black midcap magazine

Genuine Carbon Fiber tube

Polarstar Switchboard - V3 receiver so you need specific batterySwitchboard for use with dual or single solenoid cylinder conversion kits such as the F2, F1 or JACK. It is NOT compatible with the Fusion Engine. This switchboard is designed to replace the original trolley type trigger switch in a traditional TM spec V3 gearbox. It is not compatible with variants of the V3 gearbox which use a snap action microswitch trigger such as in the Ares V3 gearboxes. Header Identification: J1 = Main Harness, J2 = Poppet