Airsoft Canada - View Single Post - ICS m4 Problem: Full Auto only, busting teeth on piston

mcguyver · October 23rd, 2006, 21:49

Remove your M120 spring and install an M100-level spring. I too have had this problem when using both Systema and stock aluminum pistons with this spring load in this gun. You can try a different piston, but 400+ fps with an ICS split gearbox is asking alot.

Also, ICS uses a ratio slightly faster than Marui in their gears and ICS geaboxes were designed to use ICS gears and ICS pistons. Mixing and matching parts can lead you have poor gear tooth engagement between gears and also between sector gear and piston. This poor engagement, coupled with a heavy spring load, is what caused this problem for you.

There is no quick and easy fix, unless you return it completely to stock form. If you leave it as it is, you will to do "trial and error" to find out what works for you.

It's like saying "I'm building a car using Ford, GM and Chrysler parts. What will work and what won't?" You just have to try it and see.

October 23rd, 2006, 21:49	#2
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	Remove your M120 spring and install an M100-level spring. I too have had this problem when using both Systema and stock aluminum pistons with this spring load in this gun. You can try a different piston, but 400+ fps with an ICS split gearbox is asking alot. Also, ICS uses a ratio slightly faster than Marui in their gears and ICS geaboxes were designed to use ICS gears and ICS pistons. Mixing and matching parts can lead you have poor gear tooth engagement between gears and also between sector gear and piston. This poor engagement, coupled with a heavy spring load, is what caused this problem for you. There is no quick and easy fix, unless you return it completely to stock form. If you leave it as it is, you will to do "trial and error" to find out what works for you. It's like saying "I'm building a car using Ford, GM and Chrysler parts. What will work and what won't?" You just have to try it and see. __________________ Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy.