I am astonished some folks just don't understand that it is LEGAL to carry a long arm in Texas openly - and that the presumption is not on the carrier to prove his innocent intent.
And that's the point. That's what this boils down to.
He wasn't waving the gun around, heck, he wasn't even holding it. It was on a sling in front of him. I just don't see how they could have any reasonable suspicion that he was committing or going to commit a crime, simply by legally carrying a firearm.