While Guns.com notes that several cities have mandatory firearm ownership measures on the books, it's worth noting that Daniel put forward the two measures as part of an explicit ploy by the Republican lawmakers to "bait the left" on issues of gun control, according to The Washington Post:
https://taskandpurpose.com/missouri-ar-15-ownership-mandate
As the AR-15 became a flash point in the response to the terrorist violence in New Zealand, McDaniel's legislation emerged from the obscurity of Missouri's legislative docket. Neither measure has been scheduled for a hearing.
Nevertheless, television stations in Kansas City, Mo., grew interested in the eponymous bills. Reports appeared in newspapers in St. Louis and Tulsa. The conservative website the Daily Caller weighed in. So did Splinter News, from the other end of the ideological spectrum.
Soon, McDaniel was forced to clarify that he didn't — technically speaking — support his own bills, at least not as written.
He wants the tax credits for firearms purchases, but that part about requiring everyone to own a gun? It was a tactic to try to bait the left.
"I wanted the media and the other side to jump on it, to show that our Second Amendment rights are under attack," McDaniel said. "I don't actually support mandates, hardly ever."
https://taskandpurpose.com/missouri-ar-15-ownership-mandate