I have had this rifle for a long time now. It is a nice weapon and with just a few modifications it became even nicer. First thing I did was wire the gun to the back which is cheap if you know how to solder, Second I put a madbull M120 in it, Third a JBU aluminum piston with metal teeth, Forth I used 16AWG wiring with deans connectors and a Powerizer 9.6v 4200mah battery, and last I put a systema hop-up bucking in it. Right now my rifle is so Beastly!!
Stock this gun comes with,
Reinforced 8mm ball-bearing gearbox
Ball-bearing aluminum spring guide
Ported aluminum piston head with ball-bearings
High capacity cylinder
Double O-Ring concave metal cylinder head
Steal gears nicely fitted and shimmed
Everything is metal or aluminum except the grip and stock which are NYLON FIBER (Very Strong)
One or Two metal high-cap mags with full trades
Nicest internals I have seen on a stock gun so far!!!
Not allot but I will be honest on all points!
Hop-up Bucking is of lower quality
It is wired to the front (I hate weight in the front of the gun)
No trade marks on the rifle except for the mag (Lower receiver does have a serial #)
Mock Bolt is tight up against the inside of the body and the gear box
But over all the Pros out weigh the cons by allot.