I'v had my ICS with Sysytema gears and I used there MA-56 upper gear box (ICS) that comes with the M120 spring and have had no issues. But the stock ICS gears didn't like the M-120 spring.That being said though,my ICS is 4 years old.I hear the newer ones are better. With this set up put me at 398 fps with .20's.
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Death Before Dishonor" Bleeding Black Label"
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