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should be a 420 fps cqb monster!! i'd used the polycarb piston. nice mix of lightweight and strength, without being "soft" like aluminum. rate-of-fire will be low, probably around 11-12 rds./sec., but a 9.6v battery should bring it back up to 13-15 rds./sec. for lubricants, i use a custom silicone lube for the cylinder which i make from lightweight silicone oil and dow corning #111 silicone grease. as for the gears, i have a silicone gear grease that i use sometimes or a gear grease with a wide temp range, depending on the application. don't forget that shimming and lube is everything. spend all your efforts there and take your time. you should have bought a complete shim set as well as the stock shims may not offer you the options that you need. don't overshim so that the gears are tight when you screw the box halves together, but don't undershimm and allow lateral gear play. it's a fine balance that will ensure quiet operation and maximum life out of the mechbox, but with an m120s, it will be even more important as small issues can become big problems with the energy delivery that spring will have.
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