Hi there, I got 3 HK´s416 now. Two new ones and one from the first batch.
The first edition is not so good, there you should update the motor.
Meantime I build full systema in one and and the other one with madbull and Prometheus.
But for a Stock Airsoft the internals are good. Depends then on how you are playing. For a harcore games you should upgrade some parts.
My internals so far :
Guarder SP 130 Spring
Phoenix High Protection Gears
Prometheus 6.03mm Tight Bore Inner Barrel
Systema Complete MECHA-BOX 7mm
Systema Advance Hop Up
Systema Hop Up bucking
Systema Magnum Motor
Systema Spring Guide w/ Bearings
Systema AREA 1000 Piston Head w/ Bearings
Systema TN Coated Piston
Systema Anti-Reverse Latch
Systema M4 Wiring (To Rear)
Systema Cut Off Lever
If you have more questions on parts just ask .....
here a photo of my updatete HK´s