Figured I'd suggest this one. The Magpul FMG-9. You're probably seen videos of it, and I'd bet money it's been suggested before, but I figured I'd put my own ideas for it up. Here's pictures of it open and closed, respectively.


I figure same damage as Glock 18, same fire rate as MP5, same accuracy as the UZI.
Reload speed and recoil also about that of an UZI. Mag size of 30 (or, if Nexon goes realistic on this one, 31 round mag).
Now the big kicker, and the one that could unbalance this gun, as I figure same portability and draw speed as the 92FS. It weighs half a kilo, which means it's actually just a little over half the weight of the M9. However, this is balanced by the fact that when extended, it's 503 mm long, or about 19.8 inches - about the size of the P90. As far as draw speed goes, all you have to do is push a button on top of the reciever, and the thing unfolds right into your hands, ready to fire.
As another balancing deal, make it either not moddable at all, or very restricted. After all, putting on a supressor or an extended magazine would prevent the folding mechanism from working, and an optic would simply destroy the real-life purpose of the gun. The only thing that could MAYBE be modded onto it would be a fast-loader magazine, or since this is Nexon we're talking about, where real life purposes have no meaning, I suppose optics.
Opinions?

It's all in the reflexes
IGN is.. Irishbernier!!! What a shocker!!!