upgrading my ak105
i just bought a cyma ak105 , i just opened my mechbox, and noticed alot of plastic
plastic air nozzle
plastic spring guide
plastic piston head/piston
what do i have to get replaced for it to perform better ?
on a tight budget right now, what should i get first ?
also should i get a new barrel ?.... my bb's are not shooing straight even though my hopup is set the lowest
also should i replace my gears ?
ps. planning to put a 9.6v battery in my gun