54 percent...

“The latest polling (4/11/23) from KFF finds a majority (54%) of U.S. adults have either personally or had a family member who has been impacted by a gun-related incident, such as witnessing a shooting, being threatened by gun, or being injured or killed by a gun.”

https://www.kff.org/other/poll-finding/americans-experiences-with-gun-related-violence-injuries-and-deaths/