Most gun crimes not committed by legal gun owner. Nearly 80 percent of perpetrators carrying a gun recovered by Pittsburgh Police were not the lawful owners, a strong indication that theft and trafficking are significant sources of firearms involved in crimes in southwest Pennsylvania.

See the source article by following the link below:
Most gun crimes not committed by legal gun owner. Nearly 80 percent of perpetrators carrying a gun recovered by Pittsburgh Police were not the lawful owners, a strong indication that theft and trafficking are significant sources of firearms involved in crimes in southwest Pennsylvania.