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7 metal teeth is WAY more than you need below 470fps.
I'm not saying those pistons are BAD, because the prometheus and system supercore pistons are undoubtedly the best in the industry. But if it HAS 7 metal teeth, it should absolutely be able to handle 650fps no problem.
Up to 470fps, you should only need 3 metal teeth. Polycarbonate is an incredibly tough material when processed properly.
From the other stuff I've seen made by SHS, you couldn't pay me to use one of their pistons lol
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