What makes you think the us army would unite against them? Sure a few nut militials would be suppressed, but if gun owners in mass are raising up that means a large controversy that the military will be aware of. The us military is not full of 'yes men' who will follow orders that blindly on home turf, a lot of them will follow.
> What makes you think the us army would unite against them?
I'd turn that around and ask, "What makes you think the people would accept the gun nuts rebellion?"
Many would be celebrating in the streets if the military showed up with tanks and started blasting. Furthermore, there's enough people in the military from far, far outside whatever state is being threatened to care that much about the locals.
Again, you are assuming a small rebellion - of course those will be put down. Texas has enough gun owners to put down a small rebellion without the military (they would let the military/police do it). However if things got so far that the majority of gun owners were willing to go to war that implies the US is at least very divided and the military is going to at least partially be on the side of the rebellion.
i doubt we will see this in my lifetime