Supercell is an Epic gun perk in Call of Duty: Infinite Warfare. It is the EMC - Switchblade's exclusive trait, converting the gun from firing normal energy rounds to becoming a shot pistol, firing multiple pellets.
It is deadly in close quarters, where the generous magazine size and damage really come into their own. It does reduce range, so mid range battles are practically impossible. However, it more than makes up for it in being an easy to use pistol at close quarters as well as packing a strong punch.