"My room mate has this gun and while he is off I decided to look at the rifle more and do a tiny bit of testing. The reason he got it was for the gross ROF, and it is definitely gross, plenty of high-caps are a must. That being said, externally, the gun is plastic with a few metal parts like the mag release, non-functional bolt catch, and the charging handle (which is sloppy as can be).
Some other notable features are the older hop-up chamber with the tiny rotating wheel and gears, a metal flash hider/amplifier that matches the stock orange one, and metal flip-up front and rear sights. I personally did not like the included sights as they are heavy metal sights that are not at all fast or easy to put up and down. The stock on this rifle is kind of a hassle as I mention later, but you can lock it down and gives it a much more solid feel with almost zero wobble.
A couple big cons for me are the poorly planned externals. The front hanguard is loose, only being held into the body by two small screws that don't hold it down enough, so it wobbles around a noticeable amount. Next, the stock will only hold a 7.4 stick type lipo. There is a car type fuse in the wiring that blocks most of the buffer tube, and a 7.4 barely fits. Also, I don't know what sort of stocks fit on a G&G, but my room mate had also bought a VFC QRS stock (which is wonderful by the way) and it would only go on to the tube with an excessive amount of force, and once on, would never move (it didn't wobble at all, so that could be a plus), but it was basically a fixed stock. Speaking of stocks, the one on the gun will need to be taken off every time you change the battery as there is no flap or cover that allows easy access to the battery, so you get to fumble around with a stock, a rifle, and two batteries at the same time. Also, even though you get a handy dandy black metal flash hider, as per US laws, the orange tip is "permanentaly" attached to the outer barrel with a pin in the bottom rather than a grub screw, so good luck there.
With all of that being said, this is a CQB monster. If you found a stock that fits that will hold a 11.1 lipo, you will have a bb hose to cool off the haters. It is also just loud. The amplifier works, and when trying the metal flash hider in my long VFC M4, it makes a noticeable difference, but this is definitely an intimidating rifle with a few flaws.