||Well, I got the gun a few days ago, and I must say, excellent quality for the price. The externals are very strong plastic, and frankly look great, and its light as heck too. Handguards are stiff, but w/e, the outer barrel is kinda iffy to me(replaced it anyway) plus its kinda a pain to take off. Its different from other guns, since the front sight does not come off, which is another con. The gearbox is where this gun really shines though. 8mm Ball beaing bushings, great looking gears, standard G&G piston and silent pistonhead, all excellent quality. There is a reason why Airsoft GI uses them as base guns for their line-up. Externals can be replaced, but the internal really dont need to be. Maybe a motor swap($45 G&P m120 Ultra Speed, also a great buy, but you'll need to down grade the spring to maybe a sp100).
Internals are great
Front barrel hard to take off
Front sight molded with barrel
motor kinda sucks, but not too bad
Definatley a great way to cheaply deck out an m4, since you don't have to worry about gutting it. Just put what you want on the gun and your good to go. You may need to re-grease/re-shimm, but don't worry too much if you can't.
Rating: [5 of 5 Stars!]