This was my primary CQB gun until recently, it has about 7 months of weekends and tens of thousands of rounds through it. The internals are standard classic army with the exception of the motor, piston, cylinder and barrel being sportline parts. The externals, while metal, aren't as nice as the more expensive Classic Army stuff: the bolt catch is decorative, the outer barrel is simplified, charging handle does nothing. There are high points like the pistol grip being a Tango Down and the handguard is slim and feels like the real M4 part.
But even with those cost cutting measures this is by far the best sportline from any company bar none. Its been very reliable and its only malfunction was caused by me overheating the motor while testing a Lonex mag on full auto
Shoots hard out of the box, chronoed around 380fps
There was a replacement metal flash hider in the box.
Tango Down grip
Wiring was actually decent
High quality gearset, looks to be heat treated.
Greased and shimmed OK from the factory, not poor, but not great shim job on mine.
Trades are painted on, but they are legit.
Outer barrel is simplified, this is fine if you keep the handguard on it, but ugly under RIS
Rear sling point is plastic and breaks easy, ditch it and get a single point adapter plate.