Now that i’ve finally got a back up rifle to use while my main one is in the shop i’m ready to think about upgrades for the rifle in the shop. This rifle is my SPR as of right now it has a G&G Combat Machine gearbox, G&G Hop-up unit(totally shot), AGM M16 barrel, and a JG Super Power Motor(just about dead). So what’s good and bad on the parts market, honestly i’m looking for a brand new complete drop in gearbox, possible an ICS. What should I look for and avoid. I really want this gun to be both accurate and have at least 400fps. I know fps isn’t everything but it’s a launching point for me. Anyway throw out some suggestion. Also hop up and hop up bucking will need to be addressed. Let me know Thanks in advance!