KJW is 99% compatible with TM so I guess why not (Note that the KJW magwells have cutouts for CO2 mags with CO2 cartridges in them so you can use a TM mag in a KJW but not a KJW CO2 mag in a TM).
As for the P90, if you can just go to a PB shop or something to test the FPS, hopefully it's under but if not an M110 or M120 will do the trick. In the heyday like 2 years ago IIRC they would usually shoot above like 430 FPS but I don't know how things are now seeing as how I haven't purchased a new gun in like 4 years....
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE