The gun industry is holding its biggest annual trade show this week just a few miles from the site where a gunman slaughtered 58 concertgoers outside his high-rise Las Vegas hotel room in October using a display case worth of weapons, many fitted with bump stocks that enabled them to mimic fully automatic fire.

Gun control advocates, meanwhile, pointed to the irony of the location and planned a protest to renew calls for tighter gun sale regulations, including expanded background checks.

"We're trying to show the connection between the industry that makes all the money and the damage that thei...