Couldn’t be he went to a small alley where he purchased the necessary hardware off of a dealer in a van?
That is very unlikely. Being an honest, upright citizen, he followed all federal firearms laws and went to a federally licensed firearms store and filled out all the necessary paperwork, waited for his background check, and then waited the requisite waiting period. There is no way he would buy a black market weapon. No way. Nope.
Trust me on this.