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ICS Complete Reinforced Upper Gear Box Set for ICS M4 / M16 Series Airsoft AEG

3 Customer Reviews

by Daniel Y. on 09/20/2008
"insted of useing a 1 part gearbox can you somehow put this on a M4 other than ICS?
by troy j. on 06/11/2008
"Fantastic Kit for ICS M4's. For about the same cost as a name brand bore up kit, you get a standalone upper gearbox for quick FPS changes or field repair. You don't have to worry about whether anything is compatible with your gun, or which parts work with what. This is everything you need, all made specifically for your gun.

I have heard others complain of breaking the head off ICS pistons. You *must* LocTite the screw that holds the piston head on, or it'll back out. Causing it to wobble, thus causing the piston to break.
by Scott D. on 03/12/2014
"Solid upper gearbox, Aluminum Piston, Aluminum cylinder head with 2 O-rings, Aluminum slotted mushroom piston head, 5 slot cylinder with slots in the rear of the cylinder itself, copper coated spring for corrosion resistance, plastic nozzle with O-ring and a Tappet plate with spring. All together this kit performs extremely well under high wear and tear FPS ranges. The only bad things i can say are the spring is a standard pitch, very stiff and is quite hard to get into the upper once assembled and deforms under stress. The Tappet plate is VERY fragile - fired the system 5 times and it cracked in half.

Pros
Excellent air retention
Piston and Cylinder heads are high quality with excellent air seal when lubed properly

Cons
Tappet plate is extremely fragile
Spring deforms under tension and is hard to get into the gearbox