upgrades for a 2k3 cocker

[kola69]

i just bought myself a stock 2k3 cocker and would like to spend $100 or so to upgrade it. but my knowledge of the autococker is limited to shooting my teammates. so i'd like to know the opinions of what upgrades are worth the price. i only have about $100 to spend on it, but i hope it gives me something to do until the next practice. and 1 more thing i'm talking mostly of internals and such. i don't need to upgrade the barrel or nitro system.

thanks for the suggestions