Just adding my own 2p's worth, I have a relatively ancient cybergun p90 that works fine after much abuse over the years, though hi-caps of any type are best avoided in my experience.

I am already falling down that path which is why I am going to try and maintain self control..... 

it's a slippery slope, before you know it you will be making 4 AK74's with wooden furniture with the 4 different wood types issued over the years or making sure the AIMS side folder has the correct lever or button to fold depending on which version you want to model.