Oh they buy them most guns in the hands of gangbangers from Chicago come from clean bangers taking a trip down to Tennessee. They buy a trunk full and sneak them back to Chicago. You can find a bust in Mt Vernon a couple times a month detailing this. So saying all criminal’s gun are stolen are ridiculous. When the ATF gets off their butts and tracks down the scofflaws another takes their place.
I don't see any post that say all of the firearms obtained by criminals are stolen. Maybe I missed it. I do see a few that mention that method. I am sure that a lot of them are obtained in that way.
You mentioned another.