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Don't know about the gearset...any quality torque up set should work fine.
Guarder Infinite Torque Up motor will work...M4 rifles require a LONG type...not short type motor.
An inner barrel..is an inner barrel...the hopup rubber cuts are all the same (note: M14 and some sniper rifle inner barrels are different).
The MC51 is fine. Is your cylinder ported...it should be.
Might just be a language thing....but metal bushings will last longer than bearings
an M120 spring might give you something close to 420...it'll be easier on your mechbox and the extra 10fps won't matter at all.
Use heavier bbs.
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