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Criminals with home 3D printers are creating a small plastic piece called a switch, which turns semi-automatic pistols into machine guns, the feds say

United statesFuller parkLake countyMatthew harmonPierre johnsonTharea johnsonSargent matthew harmonLake county special investigations groupLake county special investigationsAssistant special agentChicago gunsGun modificationsGun switch3d printerAutomatic weaponChicago gun violence