Okay, this is a subject that gets a bit fuzzy round the edges and usually ends up in confussion. So I'll attempt to make it as clear as I can:
GEN III is GEN III. Makes no difference if its regular or MAX.
GEN I's were made from 04 to 05.
GEN II's were made from 05 to 06.
GEN III's were made from 06 to end 07.
From 2008 onwards they are whats collectively known as sh*t............sorry......08's.
MAX models appeared in 06. From then on they are divided into two basic types. Regular (or toy version) and MAX.
The MAX had better quality plastics, steel fore sight, stainless steel buffer tube and a full set of steel planet gears in the gearbox to allow it to fire the red cylinder.
Other than that there were no differences. Same motor, same electronics.
This is how it is now. The only exception is the Super MAX which is identical to the MAX except for a different internal gearbox ratio.
Hope this makes it a bit clearer.

