What would you think of making this a required safety feature?

[Angrboda]

In 2000, 174 children (0-18) in the United States died from unintentional firearm-related injuries. Unintentional injuries are usually caused when children play with guns or are hunting.

Unintentional injuries from firearms represent less than two percent of all firearm deaths in the U.S. But of this two percent, children and adolescents are involved in 55% of these deaths. The majority of the injuries occur to children playing with or showing the weapons to friends. The easy availability of firearms is believed to be the number one risk factor for unintentional firearm deaths.

http://www.childdeathreview.org/causesaf.htm