1 definition by Orioles fan

A firearm using a lower power cartridge and having features to make it more deadly at closer range than a Main Battle Rifle using a full power cartridge. The assault rifle is shorter and lighter and has a pistol grip and uses large capacity magazines. It can be a military selective fire weapon or a civilian legal semiautomatic weapon.

The gun industry did use the term assault rifle for the semiautomatic version. Rebranded recently as Modern Sporting Rifle or other innocuous terms.
The school shooter used an assault rifle to kill two dozen students and staff despite the presence of an armed school resource officer on duty.
by Orioles fan June 8, 2019
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