I have a G&G M4 CQB-R and while stock, the gun is amazing. I've got the tinted lower receiver but everything else is metal. The G&G has a nice weight to it. The only noticeable wobble I found, was in the crane stock... I didn't have time to get to a real chrono, but did the poor man's chorno test and I have to say this gun is shooting around 350-370 fps... The rof is nice because of the 9.6v that comes with it... All around very descent choice for beginner I would say..
If you have any questions, feel free to send me a pm....