[LUTNIT]

Where do you play that they allow over 400fps full auto?

My recommendations:
-Modify cylinder, cylinder head, piston head, and airseal nozzle
-Prometheus Ms135 spring
-SystemA all helical highspeed gears
-SystemA bushings
-Prometheus 6.03 as in your list
-SystemA Magnum motor

Modify parts (at least the ones I listed) are amazing for the price. I have had far more trouble getting SystemA/Prometheus parts working than Modify when it comes to the airseal components. Helical gears have 1.5x the area engaged at any given moment so less of a chance of stripping though standard ratio gears might still be better since you are pushing over 400fps. The SystemA turbo motor is only fast with an M110 spring or less. Past that it doesn't have the torque to maintain its speed. The Magnum motor is faster than any motor on the market (except the Turbo) and can power up to an M170 I think it said on redwolf. Also for this setup I would recommend either LiPo, dual 9.6V packs (for the higher amperage), or a large 10.8V pack.

*edit*
I have never had any problem running up to an M140 on stock TM gears. Torque up gears are for insane upgrades (500+ fps) and to alleviate stress on the motor and battery. They do reduce the ROF though. Also I have tried boreup and non-boreup kits with the same everything else in the gun (including spring) and the fps only went up maybe 10-15fps with the boreup over the normal (was using an Ms120.)