The Border Patrol also has a bean bag loaded as the first round in their shotguns; this is because the Border Patrol does what Janet Napolitano and the administration tell them to do whether or not it makes sense.
I would imagine direct theft (by the criminal), indirect theft (criminal buying from a fence), and known unlawful sales (unscrupulous pawn shop guy, or a friend of the criminal, sells to the criminal) far outweigh guns obtained from law-abiding citizens.
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