Shotguns, which generally use shot rather than bullets, are particularly deadly and accurate at close range but less so at long range. That may help explain why the shot Aguilar fired into the food court didn't hit anyone. The effective range of the AR-15, the most popular assault rifle, is at least 10 times as great as the Mossberg 500 shotgun Aguilar used. His gun held six rounds, and reloading such a weapon is not so quick and easy as replacing a magazine. In some recent mass shootings involving assault rifles, the perpetrators used magazines holding 30 and even 100 rounds; Maryland law now limits magazines to 10 rounds. Except in particularly experienced hands, it takes longer to fire multiple shots with a pump-action shotgun than with a semi-automatic rifle. Assault weapons, though not fully automatic, can fire as quickly as a shooter can pull the trigger.