I received this gun yesterday so this is more of a first looks review. Overall its a great build, few things aren't the greatest but everything can't be perfect. The lower receiver is very sturdy. 9 inch rails are awesome, I'd recommend wearing gloves or vertical fore grip (recommended G&G for $20). Flip up sights are crisp. Unlike others, my G4-A1 has Zero mag wobble. 2 things that I had a problem with is the crane stock and the butt plate. The cranestock has a decent wobble, I believe its related to the pin underneath the stock, its a bit lose. And the butt-plate's rubber tabs are hard as rock, it was difficult to remove. One of the tabs cracked and then I was able to remove it.
9.6v 2,000 mAh cranesock battery does fit, lots of excess wires so just tape the wires to the cells.
Great ROF despite stiffer spring
No mag wobble
Great look to it
Crane stock wobble
Butt-plate is difficult to remove
Flash hider was cracked a little on arrival
We'll see how it is over 30 days :)
Rating: [5 of 5 Stars!]