From Wikipedia... which tells me EVERYTHING I need to know to hate this guy.
On the evening of June 22, 2016, O'Rourke participated in the sit-in in the House of Representatives that attempted to force a vote on gun control legislation. When the Republicans ordered C-SPAN to turn off its normal coverage of the chamber, O'Rourke and Representative Scott Peters transmitted images by cell phone to social media for C-SPAN to broadcast.[129]
He supports universal background checks for gun purchases. On March 7, 2018, O'Rourke told Alisyn Camerota of CNN: "We have a great tradition and culture of gun ownership and gun safety for hunting, for sport, for self-defense... I think that can allow Texas to take the lead on a really tough issue, which the country is waiting for leadership and action on." ] He has called for a complete ban on assault rifles.