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JG / CYMA 8mm Reinforced Gearbox for M4 M16 Series Airsoft AEG with Mosfet - Front Wired
[GB-M4-MOS8mm-F]
$70.00
by Trevor W. Date Added: Sunday 29 June, 2014
Gearbox is pretty okay, but the mosfet is poop. The mosfet blew out after i plugged in my 11.1v 20c lipo battery. As for the internals, they're pretty decent. Mine came JAM-PACKED with lube. There was literally enough lube for 2 gearboxes inside of it, though strangely they didn't use any of it in the cylinder. As for airseal... it could be better. A lot better. And i purchased mine directly from the evike superstore, so i believe the gearbox had been sitting on the shelf for a year or 2 because the "M130 spring" this thing allegedly has was shorter than my stock M110 spring. As for the shell itself, ive had an m120 in it running at around 15 rps and it's stood up fine. I've had the thing for about 3 months now and the only sign of wear it's showing is on the paint outside. Now as for the individual parts, Here ya go:
*M130 spring (or at least thats what it should be) - great
*Reinforced 18:1 gearset (my spur gear recently stripped because of a jam :'() - great
*Polycarbonate piston head with small o-ring (had a poor airseal) - sufficiennt
*Polycarbonate piston with metal tooth strip (just the last tooth is metal) - standard
*Polycarbonate cylinder head with one o-ring (and an extremely long nozzle) - standard
*Non-ported aluminum (I think) cylinder - great
*Reinforced metal spring guide with ball bearings - excellent
*Clear polycarbonate tappet plate - standard
*Polcarbonate nozzle - standard
*Mosfet (this one was crappy but in most cases a mosfet would make it excellent) - good
*Steel 8mm bushings - great
*Low resistance silver wiring - excellent
*Polycarbonate selector plate w/ copper contacts - good
*Reinforced metal cutoff lever - great
*Reinforced metal shell - great
That's about it, its a decent reinforced gearbox for mid-level airsofters, and definitely go get a Gate mosfet for this is you know how to solder.

Rating: 4 of 5 Stars! [4 of 5 Stars!]
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