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this is an open beta revision of the kneelsun suppressor series with an updated readme and files, the additions include heat inserts for the indexing screws as well as an aluminum plate/sleeve to increase longevity to the inside of the cavity. the pdf guide and files will be updated in the coming weeks with feedback, the can is rated for 9mm subs and supers and the piston (which is not a regulated part) can be ordered from most major websites measured at 17mm at the piston shaft.