if it's just a standard v2 then i'd still just get a better quality standard box.
the problem with "quick change" in springs is unless the functionality to swap them out is built into the gun (ie systema's/scorpion evo's etc) then you still have to go through the rigmarole of pulling the box out to swap the spring which gets real old real fast, especially so on V2 boxes where you have to pull the motor baseplate, the motor, the grip, the various pins, the stock screw and the upper receiver every.... goddamn.... time.....
is it bad that my soul is so far gone i feel compelled to point out literally all of these problems (standard box size, running high fps, digital trigger delay and adjustable fps) are easily done on an hpa system