Total firearm-related homicides decreased while the Federal Assault Weapons Ban was in effect.

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The rate of firearm-related homicides decreased during the Federal Assault Weapons Ban of 1994.

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The rate of firearm-related deaths leveled off after expiration of the Federal Assault Weapons Ban.

Source: The sustained effect of a temporary measure: Urban firearm mortality following expiration of the Federal Assault Weapons Ban – ScienceDirect