Under federal law, the minimum age to buy a handgun from a licensed dealer is 21. But the age limit drops to 18 if the gun is being purchased from a private, unlicensed seller, which could be a neighbor or someone online, or at gun show.
For long guns, which includes rifles like AR-15s and shotguns, the minimum age of purchase from a licensed dealer is 18 under the federal law. But there’s no minimum age to purchase a long gun from a unlicensed seller.
Rittenhouse was 17 when he murdered 2 people and wounded a third… the jury and the judge found him not guilty of the murder to 2 people and wounding a third…
Here's A Thing... 