The fact that you fixate on the AR-15 and you defend this misleading information means that you aren't actually interested in protecting children. If you actually cared, you would be proposing Russian-style gun laws. What I mean by that is that roughly two thirds of all gun crime in the US (including school shootings) is committed with handguns, whereas semi-automatic rifles are used in less than 1% of gun crime. Handguns are flat-out illegal for private citizens to own in the Russian Federation, but semi-automatic rifles are not (@apnigrich can fact-check me on this). I know of four school shootings that have taken place in Russia since 2009, and in every single one, the weapon used wasn't a rifle of any kind, it was a shotgun, which is the only type of weapon that a Russian citizen may own for the first five years of holding their firearm license. Everyone I've ever spoken to agrees that the five-year smoothbore restriction is the dumbest of Russia's gun laws, primarily because a shotgun does a hell of a lot more damage than a rifle.