It is simply *beautiful*. Honestly, it's gorgeous. Very solid, heavy but not excessively so, and great finish. The pic on GI's site is the VFC (all black), the A&K is shaded like the RS. Black nylon fiber for the heat shield/foregrip, the trigger assembly, and the stock. Black metal (not sure what kind, but good quality) for the feed cover. The rest is dark grey, and it looks amazing. The adjustable ROF/MOSFET is cool, but it lowers your RPS very slightly...it's barely even noticeable, honestly. Box mag is a bit tricky to get on the first time, but feeds flawlessly. Everything is very solid on the gun. Like I read before, the two piece receiver means that it may be a bit wobbly right out of the box--mine was--but is easily fixable by just tightening the screws (GI did for me, and it's solid as a rock now).
I haven't removed the gearbox yet or opened it...I was planning on upgrading everything in it, but honestly it fires great already. ~385-400 FPS right out of the box, good crisp ROF. Here's the great part: we are pretty sure the gearbox is solid steel. It looks and feels *thick* and *tough*. No cheap pot metal for this baby...it looks like it'll take a pounding. The gun doesn't whine or clunk, it sounds like a well oiled machine. Though I will say...if you're playing a field game, you're gonna want a sling.
*Get this gun*
*Solid; feels like better external quality that my buddies' CA M249s for about half the price.
*~400 FPS right out of the box, but not over 400.
*Flawlessly feeding box mag (so far) with room for a large battery
*Solid steel gearbox (no pot metal)
*It's heavy, if you weren't aware that big support weapons are heavy. ;-)
*Slight wobble in the receiver, tighten the screws and it's fine
*It's not free?