No, you can give a firearm to your son as a gift any time you want. Just like buying one from the newspaper. Individual persons are not required to do back ground checks or anything like that like a dealer is.

However, when filling out the yellow paperwork you must indicate that you are buying it for yourself. You can not say on the paper work that you are buying it for someone else. After you buy your gun you can do what you want to do with it.