Is it legal for an 18yo to own a handgun? Yes
Is it legal for an 18yo to purchase a handgun from a third party (defined as someone who does not hold an FFL)? Yes
Does my dad hold an FFL? No
Does federal law prohibit him from making a third party sale: No
Does state law? No
Must this in-state third party transfer go through an FFL? Not if it is between father and son.
The definition of a straw purchace according to the BATF is "someone who buys a firearm for a person prohibited from having one.****
Is an 18yo a person prohibited from owning a handgun? No
Is there a required number of days you must own a gun before selling it? No
So what's the problem? I challenge you to find a flaw.
First, that's enough profanity, thanks.
Second, it's not about you being 18. Nothing to do with age at all. You're following a red herring. What he's talking about is a straw purchase.
When one person goes into a gun shop and looks for a gun, informing the salesman that he's not going to purchase the gun but will have someone else "purchase it for him" that's a straw sale. The issue is not WHY he's not purchasing it himself; the issue is that the person who is
actually making the purchase is not going to fill out the 4473 or undergo the background check, and the person who
is going to do those things is a stand-in. It makes no difference at all WHY you want to purchase the gun through a straw man.
If it's a gift, that's fine, but the gun shop doesn't know that you aren't actually the one paying for the gun.
If you're not prohibited from purchasing from your father, that's fine, but they have no way of knowing that either. All they know from what you told them is that your father is going to come in and "purchase" a gun only to turn it over to you immediately, and that there's about a 50/50 chance BATF will view that as a straw purchase.
Not doing the sale is their way of compensating for their inability to read your mind.