hey, so maybe i'm wrong here, but it just doesnt make sense to me
Which part doesn't make sense?
My A&D book contains 20 lines with 26 pages in it. Every firearm that comes through my shop must go through that book. About 90% go out on a form 4473 to a private citizen (others go out to dealers in other states in online sales). I have filled more than 4 of those books in nearly 5 years. In about 75% of those sales I have sold ammo as well. Otherwise the customer already had that caliber of ammunition at home or sometimes I gave him some as a premium. In no case in nearly 5 years did the customer load the gun and then attempt to use it on me. Nor has that ever happened to my knowledge. I tisn't the people passing the background check you have to worry about.