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You don't need a bore-up cylinder or any of that stuff. The stock cylinder is fine as it is, as are most of the internals. Replace the parts I suggested above, and maybe get a Modify piston and tappet plate too (they seem more durable than Systema). Then throw in a M120 spring or so and you're good to go. That and a tightbore barrel should put you in the 410-420 fps range. If you really want more velocity, then an M130 spring should work.
And if you're going to go that high, also consider getting a sorbo pad to absorb the shock of the piston slamming into the cylinder head. It will increase the lifespan of your mechbox.
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