Last weekend I killed my Specna Edge, I'd dropped some 14:1's in as I'd calculated that with the motor I was running I would get about 24-25rps on 11.1/3s and a more realistic 18rps on 7.4/2s.
Lo and behold after fitting the gears and re-shimming it came out great.
I am lucky to have access to a piece of private woodland and we tend to play semi or burst, no auto allowed. I was very much enjoying my new improved RoF when in the last twenty minutes of game day I noticed it started to miss the odd BB, I changed mag thinking it might be this, then it started making a grinding sound. I stopped and switched to the communal "backup" Specna flex M4 we collectively purchased for such occasions.
Stripping it down at home showed that the bearings had disintegrated on the selector plate side of the box. The bevel gear and spur had dropped and teeth were partially ground off the bevel in the couple of short trigger pulls it took for me to go "wtf is going on?" and realise I had a problem.
On the day I was running a brand new 11.1/3s 2200mah turnigy nano-tech battery with a max discharge rate of 70c, so I think this may have pushed my rate of fire up a bit, as I imagine there would be very little voltage drop under load on this compared to my older butterfly/nunchuck lipos.
I'll be fitting bushings, and see how that goes.