It's not worth paying the extra cash for the poor quality mosfet in the G&G gen 3s. It's far better to get yourself a gen 2 and fit a nice Gate Nano or Pico FET or BTC Spectre FET (the Spectres are far rarer though).
I have a Gate Nano in my DMR and I get a cracking trigger response. A word of warning though- everything else feels really clunky and slow to fire after you have a go with a 'Fetted gun!