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i picked a hurricane ftk for my sig 552, it works great shooting at 360-365 fps. i also picked up the systema high speed gears and a tight bore barrel. i find the m100 spring from the kit a little too hot for cqb so i picked up a ms90 spring. now it's shooting at 375fps. strange. i did strip the stock piston soon after installing the upgrades so i had to get a new one. listen to greylocks and just get what u need.
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