So living so close to AGI, I decided to be the first kid on the block to pick up one of the Tactical Carbine G4s. I really like the ergonomics of a full stock, and the ability to hold a large battery. The rail on this particular version is sexy, so this is the one I chose. For something a little different, I put on a set of alternating dark earth and OD XTM rail covers all around, and it looks extremely clean with that setup. It's also very comfortable. (I shy away from vertical foregrips). In fact, when you consider the comfy pistol grip as well, this is by far the most comfortable gun I own. The pneumatic blowback is so much smoother than the other blowbacks on the market, and the sound is quite satisfying.
Polymer body vs. Metal (debatable)
FPS could be higher but that limits your available fields