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This stuff is stupid quiet. So low powered it doesn’t even cycle the action in any semi auto I’ve tried it in
Discussion
Although, supposedly the Mk4’s barrel is short enough that pretty much no ammo should have the time to get up to a supersonic speed before the barrel terminates, so everything fired from it is subsonic. I haven’t verified that though
I've got some subsonic 22LR from another brand if a comparison is in order.