It's one of 27 guns seized legally by the Seattle Police Department from 16 individuals since last July under Washington State's new Extreme Risk Protection Order law.
McKenzie had been acting strange, glaring at customers of a pizza restaurant while carrying his handgun. He now agrees with the firearm seizure.
"I'm grateful that the police got the gun away from me," McKenzie told Fox News.
Washington is one of six states with high risk or red flag laws. But in the wake of the Parkland school shooting, the Brady Campaign says at least 30 states are considering them.
"I think we're seeing a building consensus in blue states and red states that this is a good way to balance public safety against people's Second Amendment rights," said Jaron Lindbaum of Washington Ceasefire.