[Tenacious 1]

Most guns on this planet are made by private companies. They take orders from governments, dealers and individuals. To suggest that the cartels would have a hard time purchasing weapons if not for the US is ludicrous.

That said, we certainly aren't doing anything to diffuse the hypocrisy. If Springfield Armory gets an order for 1500 pistols from a dealer in Mexico, what law prevents them from filling that order? Same goes from all kinds of manufacturers from Israel to Croatia. Hell, if memory serves me correctly, there are several manufacturers that have assembly plants in Mexico. I would be surprised if “lost parts” wasn't an item on the expense side of the ledger for accounting.

[Buffalo Head]

"....what law prevents them from filling that order?"

Goggle "ITAR" for the answer to your question.