G&G M14 Internals

[colonel_kipper]

Hello Chaps,
I've got a few questions regarding the G&G M14 gearboxes (Or, at least, the new batches). I worked on a 1st run gearbox a long while back and I've just got another M14 in for work. However, it's the latest model and I'm uncertain as to what has changed.
Basically, I need to know a few things regarding compatibility between parts :
Is the cylinder head compatible with aftermarket V6 Cylinder heads?
Is the Spring guide a V2 or V3 type?
Is the Tappet plate compatiblewith aftermarket V6 plates?

So far I've gathered that :
The Nozzle is an AUG type
Gears are any V2/V3 gears except for ultra torque up helicals which require removal of gearbox material for fit.
Piston is V2
Cylinder is standard
Motor is AK type (Short)

Cheers,
Help would be much appreciated.
Eddy