The gun is very nice and so is the hard case it comes with. It only has one included MID-cap mag so be sure to buy extra(s). I've opened up the gearbox and I can only say good things. I have yet to open up the hop-up unit however there is no need the gun has dead accuracy. It's barrel length is about the same as a standard M16 barrel so that will provide amazing accuracy along with the high quality bucking. It has an excellent air seal because running an M100 spring it had ~380 FPS! From what I hear, it uses and M16/M4 style air-seal nozzle so bore-up kits can be used. Gears and motor should be high torque. The externals are rock solid and will deal with lots of abuse. Also the buffer tube is bigger than an M4's so the stock won't fit on an M4, however this means that it can house a larger battery. As far as recommendations go i would do nothing to the gearbox (unless you need to down-grade the spring), a scope would look nice along with a silencer. *Note: It will not fit in the hard case with the silencer attached.
GET THIS GUN!
Rating: [5 of 5 Stars!]