Do ( D )s sell more guns than ( R )s?

[Gawdzilla Sama]

And when are the military allowed to operate to enforce the laws of the land on US soil?

Long story short - they're not.
And before you dribble on yourself spouting " exceptions! Exceptions!" ---
The simple fact is - if a President TRIED using Army troops on US soil, in armed conflict -against US citizens he' d very rapidly find himself on the wrong end of a gun - wielded by the very troops he ordered.
Any REAL service member, or former service member knows this.

Yeah, I'm just a retired CPO, what would I know about REAL service members. You spout so much sad sack shit.

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Then you wouldn't be one of the people who claim they would fight to keep their guns, now wouldn't you.

I suppose the IF I were a participant in the insurrection, then I would be fighting against a government that didn't respect the constitutional rights of its citizens. I would be fighting a tyrannical government that was trying to disarm its citizens. The violation of constitutional rights combined with the effort to disarm the citizenry is a double whammy. We would have no real constitutional rights anymore, and we would be disarmed. I could imagine that being unacceptable to me.

Several people in this discussion have said that they wouldn't hand over their guns. I don't have to fight to keep my guns. I can keep my guns without a fight. But after keeping my guns, there is still the little problem of a government that I will feel has gone rogue.

What would they be doing that would be illegal?

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"In 2006, Congress modified the Insurrection Act as part of the 2007 Defense Authorization Bill (repealed as of 2008). On September 26, 2006, President George W. Bush urged Congress to consider revising federal laws so that U.S. armed forces could restore public order and enforce laws in the aftermath of a natural disaster, terrorist attack or incident, or other condition. These changes were included in the John Warner National Defense Authorization Act for Fiscal Year 2007 (H.R. 5122), which was signed into law on October 17, 2006.[9]"