[Spa]

There are some springs with rounded bottoms instead of flat ones. (Stock CA springs for example). I have seen springs from PDI and KA that have rounded ends. If the spring guide is not of good quality(eg. plastic ones with a washer), the pressure of the piston being pulled back can actually cause the springs end to slip off the area with the ball bearings on the guide (dont know how this happens, but its possible from pressure). When this happens the piston cannot be fully pulled back and thus the sector gear cannot complete its cycle becuase the pistons last tooth or the teeth near it are holding the sector gear from moving.

The way i fixed it was I just put a spring with a flat end in the gun and it started to work without any jams.

I hope that helps. Weird things hapeen to AEG's like the back of a gearbox blowing off or a spring guide cracking, etc.

And illusion your right about the shim job. I forgot even at 50% or 99% resistance they can still move:P I just had times where 1x0.15shim actually made the gears not move at all.

and when are those phoenix gears going to be in stock at WGC, I wanna purchase a set just to see how they perform.