No. But I don't think it applies in this case. Prior to purchase yes, after purchase, no.
Before the 1968 GCA, many states such as mine, CA, did have mandatory safety training for minors, over 12 years and under 18, to receive "Hunter Safety Training" before they could be issued a hunting license. The NRA was the state mandated organization named to provide that training. No one, in those days objected. Least of all, the parents.
What some of you are trying to imply is that there was no gun control before the '68 GCA or the Brady Bill, but there was. We controlled ourselves. We feared our Dad's more than the sheriff. A gun store owner could refuse to sell a firearm and he wouldn't be sued. Now he would be. Now it is the movies and other children that teach children how to, or rather how not to, handle guns. I consider ignorance to be a real "infringement" on my rights.
Among those of us that hunt, the unsafe were shunned and not invited hunting the next year. I don't think it is infringement if the other hunters along the slopes of the Sierra Nevada Mountains are trained in the safe use of a hunting rifle. Quite frankly, it is your duty to yourself and your family, other hunters AND the 2nd. Amendment that you do seek training. I know you'll disagree with that, but two of my hunting partners are now watching this post, over my shoulder on this computer at my office, and are moving their heads in agreement.
I do not believe the 2nd Amendment applies to children, period. To shoot a gun is a privilege afforded to a child by the childs parents. When the child is an adult, 18 or 21, the 2nd Amendment applies. If you have a problem with age, or "Maturity Qualifications", take it up with the Constitution. It sets the age at being able to represent your neighbors in Congress at 25yrs and your state in the Senate at 30yrs. Oh, and since "Everyone can grow up to be President", any Natural citizen cannot do that until they are at least 35 years old. Is that "infringement"? I don't think so, I think it is the wisdom of the Founding Fathers.
Do you also support state-mandated potty training?
For you, personally? Yes!