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Where did your mechbox crack? Up front by the end of the cylinder? It'd be nice to get a pic...those KWA mechboxes are supposed to be reinforced and have more material up front than most reinforced mechboxes.
If you want to save yourself some headaches...
1. Buy a good quality mechbox (KA reinforced, Systema)
2. Use good quality bushings (modify make very nice ones that aren't expensive)
3. Don't use the aluminum piston head that came with the KWA
4. Unless you're running a really long inner barrel, there's no need for a bore-up kit
5. Unless you're KWA is different from most others...the hopup and nozzle are different than "normal" ones. There's a ridge that runs along the top of the nozzle that indexes into a notch in the hopup. If you're using a regular (i.e. plain, round) M4 nozzle (probably the bore up one that you installed) with the notched stock hopup unit...they probably aren't matching up well, resulting in an air loss. Doesn't take much to drop a lot of FPS.
6. The stock piston isn't bad...although I replaced a shattered one last week. Be sure to loctite the piston head onto it's screw.
A Modify M110 in your setup might put you over 400fps w/ 0.20g bbs...a Modify M100 will probably be in the 350-370fps range. But it depends on a lot of other factors.
Best of luck,
Tys
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