The only ar I've seen in anything vaguely related was a drug bust. Only thing was, the ar in question was a softair plastic pellet gun. There might be some limited incidences of ar's falling into the wrong hands, but none that I know of.
According to the cops I know, the firearms most commonly used by criminals are cut down shotguns, .22's and old .303s with all three usually cut down to pistol length. Mostly this is because they're the most commonly available firearms, and the law of averages says the more prevalent something is the more likely it is to fall into the wrong hands.
There are already lots of urban legends about OMCs having full auto kit anyway, so semi-autos aren't really up there with those, and at the end of the day, a half-way competent machinist with a P habit could pay off their debts with hand-made pistols in fairly short order. After all pistols are much more practical for criminals, and cad plans for pistols are all over the web....
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