Golden, you may have not heard the whole story. He was instructed by U.S. Customs officers on proper procedure and he followed it. He is being charged with having a Mexican military rifle which is illegal. It was an antique 410.
Let's break down what you wrote,
He was instructed by US customs on what's legal here, they were wrong on mexico info if actually given to him( his responsibility to research it, they are US customs officers and gave him US rules, he was going into another country. The gun he had could be brought into the us legally, IF he had all proper procedures taken care of prior to entering or exiting..
The laws of mexico are instantly available with a search( nothing below says it's legal):
Entering Mexico with a firearm, or even a single round of ammunition, carries a penalty of up to five years in prison, even if the firearm or ammunition is taken into the country unintentionally.
If you have ever shipped anything outside the us through say usps,fedex or ups.. If you have the slightest inclination it may be prohibited, what is the first thing you do?
If you have been on a cruise outside the us or taken airplane flight somewhere in or out the usa, and wanted to take a gun. what did you do about the gun?
See what I'm saying?
Before we attack another humans thought's for speaking up. We should look at our own thoughts of what we would do prior to making a decision or suffer the consequences for lack of thinking....
I'm done with it, best of luck to him and all of you. Take Care Merry Christmas and Happy New Year... PM ME if you need me.. Like they say on Shark Tank, I'm Out...God Bless All...