For: JG M4 M130 Complete (Front Wired) AEG Gearbox w/ MOSFETProduct Information:
I love this gearbox to death, but itís a total pain to fix up. Perhaps itís just mine, but you literally need two sets of hands to just close it. The internals provided work extremely well for the price. The reinforced shell was enough for me to buy this, but it comes with a huge list of upgrades you will normally see on JGís higher end guns. I use it in my current M4 and it works like a charm. Out of the box, the shimming is okay, but it doesnít hurt to reshim it. The box I got was loaded with a crap ton of lube as well ran quite silently. The MOSFET isnít something to rave about (and it makes wiring a bit more confusing Ė The three plugs, yes three, is strange and I had to use a PEQ box to fit everything), but itís a nice feature. Overall, a great purchase for the hands-on guy.
Just about every inch of the gearbox is an improvement over any stock gearbox
For a JG box, it comes decently shimmed
Comes with a reinforced shell and functional MOSFET (turned out to be an APS unit)
MOSFET isnít really sophisticated
Air nozzle didnít have an O-Ring
PITA to close