Just funning you dd,
I don't really think you'd have a problem at the border or at least I would hope you wouldn't.

It doesn't bother me when I drive thru states that allow hunting rifles stored  in the pickup cabs.  I don't fear the legal law abiding citizens.
Sure some occasionally go off the deep end, but most violent crimes are by criminals with illegally stolen weapons.

Only a " Hollywood type" mentality would think no-one would respond to rounds being fired from a tower/building, especially in a right to " pack" state like Texas ;)