||It comes with a metal hop up.
The gun comes with an aluminum piston stock, which are impossible to break on the stock gun. Now, if upgraded to shoot an insane fps that will break the gearbox and everything else, you might chip a tooth, but no.
Also, the internals are the best in any stock M4 on the market. Everything is top notch high quality. Better than KWA, G&G, ICS, CA, TM, STAR, Guarder, the only company that beats the internal quality is Systema. Enjoy a $1.5k gun if you can afford it. The only bad part to this gun is the factory shimming...sucks. The gun may not need to be reshimmed, but it is highly recommended. Of course there are plenty of high quality guns that need to be reshimmed, this one is no different. Also the stock hop up is not the greatest. I recommend getting a new hop up if you NEED to make shots past the 130-150 ft mark.
The externals are unbeatable. Period. The material used for the receiver is diecast aluminum, which might not mean something if you are fine with brittle plastic or bottom-of-the-barrel zinc alloy. Diecasr aluminum is the same material used in Colt M4s. In fact, the externals are almost identical to the real gun. The difference is that the receiver is slightly bulkier to house the gearbox.
-Internals that beat every other M4 on the market, barring Systema, which is not exactly meant for the public but rather a training weapon for armed forces.
-Externals that are better than every other M4 on the market, barring Systema if you actually care about the slight difference in size of the receiver.
-Quite possibly the best gun under $330, if not the best.
-Shoots 18 rps with a 9.6v battery stock.
-Shoots 375-390 stock (can shoot through bottom center of a coke can using .20, verifying _380)
-KAC trades ftw.
-Like most AEGs, it is highly recommended you reshim out of the box.
-If you are required to make shots that are past 120 or so feet, than a new hop up wouldn't hurt.
Rating: [5 of 5 Stars!]