I currently have a toyko marui hk usp gbb which I want know if it is possible to turn into full auto? I also have a kwa hk 45 gbb which from my understanding can't be upgraded because it is difficult and doesn't have many upgrade parts. I gain all my knowledge from my local airsoft store so please forgive me for my dumb questions as certain members in the store can't answer my questions. I understand that the tm glock 18c and the kwa atp-se are semi/full-auto. Which would recommend? My last question Is it possible to turn any tokyo marui into full auto capability for example the hicap 5.1 and still keep the semi on it? Thank you for your help and time.