Late to the party, but that packing job definitely seems like Evike's doing. A G&P M4 I ordered from eHobby came packed up solid with the extra backers like Pagan mentioned. That's a pretty terrible packing job on their part.
If you have the issue Gimpalong mentioned with the charging handle, all you have to do is bend the top edge of the faux BCG so it will slide back and forth a bit easier as it can get deformed and get caught either from shipping or from constantly racking back and forth.
Side note: this thing on full auto with the 11.1 is scary.
See, that's what I'm a little scared of. Especially without opening it up and reshimming and correcting AoE. It seems as though this gun, with the current motor / gear ratio, should really be run on a 7.4V. Of course the people that say that an 11.1V tears these guns up in a hurry, probably didn't tune their gun any. It's kind of rough reading forums when you don't know the competence of the people commenting, sigh. On the one hand I want a fast trigger response, I don't care about auto because I don't use it, but on the other hand I don't want the gun destroying itself. I might look into a high torque, neodynium magnet, motor for a little later.
I have two G&P M16's that were purchased brand new from Airsoft Global about 4 months apart. One (an FN M16A4) is superb in almost every way, and according to Google Earth shoots in the neighborhood of 190' bone stock right out of the box. The other(a Colt M16A2) is very nice to look at, but came with a loose stock, the gearbox just did not sound right, and struggles to hit 150' according to Google Earth. Both fire 430 fps and have M120 high speed motors which rip like crazy on an 11.1.
Given the same exact parts, assembly of the individual unit is the most important factor and often the largest variable. Looks like you may have landed a Monday morning or Friday afternoon rifle.
An anecdote about the G&P M120 high speed motor. I ran one years ago on an 11.1 lipo for the insane semi auto response. The AEG had a stealth MOSFET, Deans, and a Gens Ace 11.1 20C lipo. The motor died fairly quickly. I would estimate less than 25,000 rounds. The brushes were completely burned up and the commutator was pretty mauled. I have since read that they should not be run on a lipo as the brushes will burn up quickly. Never looked into a possible fix as long life motors are plentiful and cheap.
I shot the gun. It's chrono'ing right under 400 FPS. It can barely hop .30s (which is normal) and the range is pretty decent, but the accuracy is meh. I already have a Prome coming in and when that gets here I'll swap the hop-up bucking for the KWA and see how it shoots then.
Shameless plug for my airsoft chrono calculator, useful for converting Joules to FPS/MPS and determining what FPS difference there would be assuming no loss or gain to Joule creep.