A Chicago Neighborhood Faces a New Fear: Assault-Style Rifles

[jimmy the one]

3. spillover crime

but the use of an AK-47 or AR-15 rifle can wound far more victims in far less time, leaving the police overwhelmed and residents ever more wary of venturing outdoors.

Some smuggled into chicago from gary indiana which is maybe 20 miles east of chicago, or statewide indiana gunshops (imo), where assault rifles are not illegal. They are illegal in chicago, but legal in illinois.
Gary Indiana in the past was a prime depot for handguns getting into chicago illicitly during chicago's handgun ban. Gary also had in the past a higher murder rate than chicago, generally always. But the gun lobby always argued it was due spillover crime from chicago. Actually, hard to say.