This video is of a suppressed mini uzi submachine gun being shot at a subgun competition. The caliber is 9mm and the distance at the farthest shots are about 40 yards. The suppressor is a Gemtec MK9k, the Mini Uzi is a Vector Mini Uzi SMG. The rounds are 147 grain subsonic 9mm home reloads.
It sounds like a stapler clicking when shot.
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