“While most parents would not allow their 2-year-old to wield a revolver, we pass laws for those parents who lack the parenting skills needed to protect their own children,” Mascher said, citing seat belt, smoking and car seat laws.

Mascher cited the case of a 9-year-old Arizona girl who in 2014 accidentally killed her shooting instructor with an Uzi. The girl said she felt the weapon was too much for her and hurt her shoulder, according to the police report.

Rep. Art Staed (D), who said he's a hunter who supports the Second Amendment, said the legislation is a public health threat and not gun rights issue.

"I would not allow my children to have access to guns," Staed said.

Iowan Nathan Gibson told local news station KCCI he's been shooting guns with his daughters since they were 5.

Sisters Meredith Gibson, 12, and Natalie Gibson, 10, were among those lobbying in favor of the bill. Natalie told the station a gun is only dangerous if handled wrong.