The law only states that you cannot buy one from a Federal Firearms License holder.
You can buy one from anyone who is not a Federal Firearms License holder, and also recieve themas gifts, inheritance, etc. If someone had a handgun they decided they didn't want they are free to give it to you or sell it to you.
The problem only comes in place if someone buys it from an FFL specificallywith the intent of delivering itto someonewho cannotbuy a gun. Just don't allow that to happen and everything is okay.
I'm 18, and legally own and carry handguns.
Have fun carrying your AR-15. I wish I had one!