Review on AOLS Reinforced Piston: Unrivaled Strength with 14-1/2 Full Steel Teeth by Dan Bobbert

The first one broke (due to my fault). It was full speed at 39 rpm at around 375 fps. maybe 380. Fps should be in the 410 range, but I have an air leak somewhere. I'm guessing it's the jump up to the air vent. Although the quality of this piston is excellent, the rail was pulled out because unlike you I did not glue it due to the intensity of the overall assembly. No damage to the teeth at all. Generally the piston broke because when it broke the combined force broke the edge holding the rack in place. I recommend it to anyone who wants to upgrade. Just glue the rack and swiss cheese when you put it in a fast gun.