[MaciekA]

Most of the jam strips I've seen strip the piston somewhere in the middle, whereas a pickup tooth failure is associated with incorrect AoE. In a jam the piston can't reach the front of the cylinder because it is jammed, leading to the stripping of teeth in the middle. If the sector gear was able to repeatedly hammer on the pickup tooth at an odd and stressful angle until failure, then we at least know the piston was firing out BBs most of the time.

Your angle of engagement (AoE) may be insufficiently set to prevent catastrophic failure.

Amos made a very nice video about this on his YouTube channel. Go check it out, he explains it visually.

Basically, you want the first tooth of your sector gear to strike the pickup tooth on your piston flat-face-on-flat-face -- i.e. maximum contact surface area. The best way to accomplish this is to get a sorbo pad (airsoftparts has em) and stick to the rear of your cylinder head. This will move the strike position of your piston back enough that the two teeth can achieve this angle of contact. You'll then need to test the engagement out by hand and check if you need to remove any teeth from your piston to allow the sector to hit the pickup tooth before hitting anything else.

I wonder how Tokyo Marui would have changed their original design of the mechbox if Japan didn't have their sub-300fps safety regulations.