Now playing Next USA US pro-gun group NRA advocates new rules surrounding 'rapid fire' gun attachments A "Bump stock" is a rapid-fire device which allows semiautomatic rifles to fire faster 05/10/2017
Now playing Next USA Republicans open to 'bump-stock' gun controls after Las Vegas massacre The legal but controversial devices can transform guns into fully-automatic weapons capable of firing multiple rounds in long bursts. 05/10/2017