changing spring on ICS M4a1
 

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)

Win!

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