Originally Posted By: ArcticDriver
Originally Posted By: eljefino
Let's remember this is OP's POV.
His son has all these parts "except one" but magically and only according to OP this is going to wind up assembled as something of "his".
Yes, I was a bit skeptical of that claim as well...
First things first, the son is under 21. He can buy an assembled rifle legally, at age 18. He cannot buy a pistol from a FFL legally until he is 21. He also cannot buy a lower receiver legally until he is 21, since they can be used to build a pistol, or a rifle. His son can purchase a pistol legally in most states via a private party sale. Or his son can be gifted a pistol, legally in most states. So legally speaking, a person between 18-21 can legally own a pistol, they just cannot buy one through a FFL dealer.
Its very common to have a LOT of left over parts when you get into the AR platform rifle. People are constantly upgrading or changing parts. Numerous times I have looked in my spare parts stash and said, "oh look, I have a complete rifle here if I just had another $39 lower receiver." So off to the gun store to get a lower, and 2 hours later, I have another complete rifle.
There is nothing fishy about the OP wanting to purchases a lower so that he and his son can build another rifle from his sons spare parts. It doesn't matter if the rifle will be owned/retained by the OP, or owned by the son after it is built. As it is perfectly legal for the OP to retain the lower as his, or gift it to his son.