This is 22-year-old Joseph Kelley. The gun is an unloaded AR-15.
"I felt no negative vibes from anyone," Kelley told the Salt Lake Tribune, after these photos snapped by fellow JC Penny shopper Cindy Yorgason went viral. "I think it went rather surprisingly well."
Kelley added that he carries guns to protect people from "criminals, cartels, drug lords" and "evil men." He was also carrying a loaded Glock 19c.