This is actually a couple of issues, more or less I'm wondering if this piston is still usable. This is all speculation and somewhat educated guesses(I could be way off)
I'm running a stock CA AK SLR-105 with a large 9.6v 2000mAh. My initial concern was the battery was too hot(the guy at the battery store made an 8cell instead of a 7). My fears were confirmed when my gun was double firing and generally loading erratically and causing the gun to jam, and on semi it would half cock the piston on the second shot.
Well, after the first 10 minutes, it jammed completely, and couldnt turn the gears over in the mechbox. I took it apart, and the first thing I noticed was the screw that held the piston head on had fallen off. The second, was a groove worn down the center of the piston, obviously from the sector gear.
Not the greatest quality but it gives you a general idea. While its apart, I'll upgrade the spring, nothing to extensive, just so it shoots around 360ish. Two other concerns
1) With the stiffer spring will running a 9.6 slow the gear box down enough to rid myself of this feeding/jamming issue? Or should I just bring the batteries in and take a cell off to make them an 8.4
2) Should I go with a full tooth piston? Can I use the one I have, or just buy its direct replacement? Assuming all common internal parts fit CA guns
Thanks in advance