Ok, now that I have used this gun let me give you my thoughts on it. This gun is absolutely amazing! I have owned various types of guns throughout my time in airsoft, and this one has to be the best. I decided to install a tight bore barrel instead of leaving the stock one in and let me tell you it made a huge difference, I got about 30 more feet of range, so the range is out to about 200+ feet. However, I would recommend installing a type 1 cylinder to up the fps a bit. Also the ROF on this gun is very high with a 9.6v battery, about 19-20bps. Get this gun, you won't be disappointed.
Build quality (no wobble what so ever)
Magazine(be wary of MAG brand mags, they don't feed very well)
You don't have one
The bolt does move the hop up back, so I'd be careful with adjusting your hop-up, I'd suggest setting it to just a little over so when the bolt moves forward it moves the hop-up to the correct place.
Nothing else really, you'll be very pleased with this gun, also if you run midcaps I'd suggest getting K120 midcaps, they feed flawlessly in this gun.