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I have the eagle force 1300 and it definitely increased ROF. If you don't want a ROF increase, don't get an eagle force 1300.
If you want faster trigger time, you'll have to increase motor response time... which, unfortunately, means higher ROF.
Torque up gears will slow down your ROF, and thus, your trigger response time.
Vented piston head won't make a much markedly noticeable difference, but it does help a bit.
I've done exactly what you mentioned with the bearings. It helps a bit as well.
Recommended: Get a set of Prometheus gears. They have five anti-reversal nodes on the bevel gear, rather than 2 or 4. This helps the gears lock the piston in a further back position, reducing the next shot's wind up travel distance & ultimately, the time required.
I run this exact setup with a KM 90M spring, Prometheus double-torque gears, KM cylinder, systema aluminum piston head, systema red piston and a 600mAh Nicad battery. Freshly charged battery, my P90 screams and has a faster trigger response time than any of my other guns. However, ROF is also much higher.
I chose to do it this way because I wanted to stick with an 8.4v NiCd battery without having to do any destructive mods to the stock. Hence, J-batteries were out of the question. I can get out about 1000 rounds with this setup before the battery poops out.
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