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Authorities reported that the gun found in Mangione's backpack was self-assembled on a 3D printer and included a suppressor, which serves to muffle the sound of gunfire. This loaded magazine contained six nine-millimeter full metal jacket rounds, indicating a preparation for potential use beyond a mere possession. Josh Campbell, a former FBI security correspondent, noted the alarming trend of ghost guns across the nation, emphasizing their untraceability and lack of serial numbers, which complicates law enforcement efforts and background checks.