Best Gun I've OwnedThis has been my favourite gun as of yet. It's a great looking replica of the real G3 used in WWII.
The accuracy out of the box is quite good and functionally, it works great and feels extremely reliable. The stock has plenty of room for any battery that you want to use in it, which is great.
As for the build quality, this gun far outclasses any other gun in the airsoft market. You could run it over with your car/truck/semi/airplane and it probably would still work as new. Magazine fitment is absolutely perfect, it feels as though the mag is welded into the gun when in use. The bi-pod is quite sturdy as well. This has been, hands down, the MOST SOLID GUN that I've seen. Keep in mind though that it weighs 10 pounds, and you might get tired after using it for a full day. I've never cared about that though because I have so much fun using it.
One important note: it does not have a built in MOSFET. I would recommend getting one installed to up the competitiveness and safety.
The only thing that I don't really like is the pistol grip, which I think is a tad short. However, that doesn't matter too much unless you have excessively large hands.