ICS m4... ahhhh...
Here's my story with ICS.
I started out airsoft with an ICS m4! It's a pretty neat gun to be honest, but I wanted more... Both outdoor and indoor... I first bought a upper receiver from Mech, then bought a long RIS, outer barrel, and a tightbore. Now here's what happen. The RIS came in first, found out the treating didn't fit, so returned it to the person I bought it from, he was happy to take it back. After, the upper gearbox came in, I put it all together nice and neat. Charged my 8.4 battery. Then went down to the basement to "test" fire it. First semi shot sounded great! Then two quick shot which worked. Then full auto went something like "pop, pop, rummmmmmmmmmmmmmm". The gun stop firing, but the motor is still spining. Turns out I stripped 2 of the 3 gear in the gearbox. The one connecting to the moter is strip clean, no teeth left. The big flat one is missing 2 tooth. I reread the upper gearbox and it says "400fps". So then I bought new gears, fixed the gun, sold the upper, and sold the what was left of my gun.
Long story short, I'd recommend upgrading the gears before placing a high spring in. Not sure if this happen to anyone, but it was a money kit... My goal was to make it so one upper is for outdoor, once for indoor. Two different length of barrels for better grouping and accuracy. but in the end, I wasted over $300 dollar trying to pimp out my gun...
So I would strongly recommend sticking to the stock gun as much as possible.
But now I'm feeling ICS again, and bought myself a new ICS m16. Now I'm just waiting for it to arrive.
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