The gun used in the Dayton shooting (top) has a barrel that’s shorter than the federal minimum for a rifle. Legally classified as a pistol, it was fed by a 100-round “double drum” magazine (lower left). A close-up of the gun’s lower receiver (bottom right) shows the only part of the gun that is legally considered a firearm.

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The gun used in the Dayton shooting (top) has a barrel that’s shorter than the federal minimum for a rifle. Legally classified as a pistol, it was fed by a 100-round “double drum” magazine (lower left). A close-up of the gun’s lower receiver (bottom right) shows the only part of the gun that is legally considered a firearm.