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Never get the purple Modify pistons. I had one bnib and it shattered after 200 rounds. Its a cheap polycarb piston. However Modify Ultra High Speed (the white one) is not bad, I've had one in one of my guns for a few years of hard use before I had to replace it. Bad BBs caused a jam and stripped it. Its really been one of my goto pistons.
I've also been running the SHS 14 tooth piston in a high speed setup with little to no issues. I would say correcting AOE and shimming counts more with using full metal teeth racks.
Also the stock Mariu piston is actually a pretty good for a stock piston. I'm using one in a medium speed build and it is holding up beautifully. Only mod I did to it was shaving off the first tooth and some of the next two teeth.
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