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I have run CCI quiet in my semi auto MK pistol suppressed and keeps double feeding so those go to a bolt .I used Ely subs and in the pistol they run flawless and are quite and will run in the semi pistol and semi auto rifle and are pretty clean . I now found a new gem @ 1106 fps the Lapua Polar Biathlon and man are they quiet and they run in the pistol without issues and super clean but a little on the expensive side .