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We recommend one for your bedroom and two for your for bathroom.

One thing struck him as particularly odd:

" ... as I'm ringing up the transaction, he has one of those little drawstring backpacks. He pulls a paper bag out, takes out 10 grand in cash rubber-banded in thousand dollar increments. It was weird that, one, he came in with $10,000 cash. And he didn't want any ammo for it or any optics for it. He didn't know much about it beside the fact that he wanted it."

We might have chalked him up as just another Call Of Duty fan with impulse problems, but our source considered this a "red flag" for straw purchasing. A straw purchase is when someone buys a gun legally, but then hands it over illegally to another person. This is how the cartels get the vast majority of their arsenal. Eighty-seven percent of traceable firearms seized by the Mexican government have been traced back to the U.S. We've inadvertently "gifted" Mexico with more than 64,000 firearms over the last five years.

Sandy Huffaker/Getty Images News/Getty Images

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"We're going to build a wall to keep the guns out. America will pay for it."

Our source and his manager didn't call the authorities immediately -- buying a fancy gun with cash isn't illegal; otherwise, how would we have rap videos? But, gradually, their suspicions began to pile up ...