I don't know that they will cross the Rubicon and send a former President to prison since the pendulum will eventually swing and the Rs will follow that president and do the same to the criminals with a D behind their name.
If they do, I don't expect much to happen. They say there are four political boxes. The soap box, the ballot box, the jury box and the cartridge box. My super MAGA buddy is big on the first two but to the best of my knowledge he doesn't own a firearm, his military experience did not involve combat and I would not anticipate him doing anything violent. Actually, I have several conservative friends who don't own firearms; two of them because their wives are unstable, and they are concerned that they might use one to harm themselves. And, I have liberal/progressive friends who do own firearms. In the words of one of them, "We lefties like our guns too."
You might be overestimating their gun ownership and especially their likelihood of using them, though I agree that some might.
1/6 was an insurrection where the insurrectionists left their guns at home. The notable exception was the Oath Keepers.
I was a founding member when it was advertised as a non-partisan organization. I should have seen it coming, but when I saw it become partisan, I ended my membership. Stewart Rhodes has already been convicted. He seemed reasonable when I met him, but then came what was probable delusions of grandeur.