You're asking us for the impossible.
Imagine if someone on a guitar forum asked how to upgrade his Guitar Hero guitar-controller to play like a professional acoustic guitar. That's basically what you're asking us.
Just as there is a minimum level of entry investment (hand-me-downs, pawn shop, garage sale deals aside) for guitar, there is also a such a minimum for airsoft. Below that, we really don't have anything to work with.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."