The way I understand it, gifting a firearm at some point after transfer is fine but for purposes of the initial transfer from the dealer you better be the intended recipient. The first question on the 4473 is whether that person is the actual transferee of the weapon. It's a disqualifying answer if you answer "no". I would think that once the dealer has reason to suspect that it's a straw purchase (in this case somebody giving the transferee the money) it follows that the dealer has reasonable suspicion that the answer to the first question is a lie and that he is not to proceed with the sale. The questions on the 4473 aren't just for fun.
I found this explanation on the NRA's site, and I like it.
(Here is the wording on the 4473)
Are you the actual transferee/buyer of the firearm(s) listed on this form? Warning: You are not the actual buyer if you are acquiring the firearm(s) on behalf of another person. If you are not the actual buyer, the dealer cannot transfer the firearm(s) to you. (See Instructions for Question 11.a.) Exception: If you are picking up a repaired firearm(s) for another person, you are not required to answer 11.a. and may proceed to question 11.b.
NRA:"...If you answer “(no)” to this question, the sale cannot proceed. If you answer “(yes),”
you are stating under penalty of law that you are not buying the firearm for someone else, other than as a bona fide gift. .., if the purchaser knows or has reason to believe that the person for whom the gun
is being bought is a felon or otherwise prohibited from possessing a firearm, or if the purchaser knows or has reason to believe that
the gun will be used in a crime, those are federal felonies, each punishable by up to 10 years in prison and a $10,000 fine."
Seems like any of us could purchase a gun from a dealer and tell him flat-out "I intend to give this to my wife as a Christmas present" and no crime has been committed by anyone.
This is from FFL123: "Simply put, a straw purchase is
when one person buys a gun for another person who is not allowed to own a gun. It is a way for a person who is not prohibited from owning a gun to get a gun to somebody who is.
Straw purchases are a common way for felons, gang members and criminals to get guns. However, there are exceptions to what constitutes a straw purchase. For instance,
you can legally buy a gun with the intent to gift it to a non prohibited person. That isn’t a straw purchase. A straw purchase would involve either a prohibited person or an exchange of money."
The "exchange of money" clause might be problematic, but no moreso than when we use Paypal Friends and Family to "gift" money to a GlockTalk buddy who "gifted" us a holster. If I buy a Henry Golden Boy for my non-felon son's 18th-birthday present, and he gives me $600 from his landscaping salary as a Father's Day gift, are we both felons?