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Old August 7th, 2010, 07:05   #2
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Join Date: Apr 2008
Location: Montreal, Canada
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Originally Posted by timtom1 View Post
I've ordered a new spring the systema M100 for my new ICS M4a1 how do I change the spring myself?
  • Take out your upper gearbox
  • Open it
  • Swap the old spring with the new spring
  • Put it back together (ensure all pieces are in the same place)


Edit: here's a youtube video.
YouTube- ‪Airsoft ICS M4 Gearbox Assembly Guide by AirSplat‬‎
**FAST FOWARD TO THE 3:30 minute mark to see the uppear gearbox assembly

Last edited by gmds44; August 7th, 2010 at 07:08..
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