I know a lot of you guys have ICS M4's out there. My question to you is, how have you upgraded them and what FPS are you shooting with your Upgrades?
I have had my ICS M4 apart no less than 100 times. No matter what I seem to try, it is 380 FPS or bust (unfortunatly literally). Right now I have a silent piston head set, full cylinder, tight bore barrel, metal bushings, spring guide with bearing, and a systema M120. All that and barely shooting 380 FPS consistantly. I tried an M130spring, the motor and gears wont budge it, or die trying. PDI 180 forget about it. Different gears, wont fit. Aluminum or polycarb piston, FPS go inconsistant.
I think it has finally become an obsession of mine to get this gun to shoot 390FPS consistant.
So if you have achieved the holy grail of upgrading with this gun (400FPS) and the gun shoots reliably. Please share your secret with the rest of us, under achieving Airsofters.
