|
To me...
Looks like the gear slipped off the last (metal) tooth and raked the plastic teeth.
1. A crappy piston that let the last tooth flex/break out of position, allowing the gear to rake the plastic teeth is possible. That would be a piston failure.
2. If it was cycling way too fast...the sector gear came around and picked up the piston on the 2/3/4'th tooth, the piston would jam back and then the last tooth would break or slip out of positon and the gear would rake the teeth as in the pic. That'd be early engagement.
3. If the piston was getting hung up on the rails, it could result in early engagement and break/strip things as you described. But I find it a bit unlikely as it did shoot/cycle a number of times and 3 shot bursts before it failed (unless it sounded like a grinder for those shots).
It didn't sound like there were that many shots before failure...but there doesn't seem to be any wear/tear on the first tooth (pickup) or second.
|