Likely no, 420 is probably their hard cap. It doesn't matter, if your gun is over and/or that inconsistent, then it'll need a change regardless at some point. Get it to a gun doc and get a spring swap so you can play (many stores have docs and springs), or make arrangements to borrow/rent a different gun for now.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē