I like how he noticed that "gold or lead" was wrong. It actually is "plomo (lead) o plata (silver and slang for cash)". Note how plomo o plata rhymes, which is why Hispanic gangsters say it before bribing/murdering cops.
However I am surprised that the guys didn't know that anti-tank weapons are in high demand by Mexican drug lords. Because sometimes the Mexican Army has to straight up go and take a village with tanks.
And the gangs are starting to build tanks to fight each other. No really, it like Mad Max out there, who ever has the biggest gun is the law. They have discovered around 20 at this point.
http://www.bbc.co.uk/news/world-latin-america-13488620
Not to mention that anti-tank weapons are a good way to kill cops/politicians/lawyers/civilians who are in a car from a decent range.