what will happen when the National Guard try to disarm all the armed right wing militia?

By arming themselves with weapons that are not illegal, the right wing militias are doing nothing that is illegal. So there is no reason to disarm them. If their weapons were to be declared illegal at some point in the future, then there would be a reason. A buy-back program would be one of the first steps. It's unlikely that there would be an organized effort to find the hold-outs. Those who didn't surrender their newly declared illegal weapons would be held accountable when they were discovered. That's how it works now. 

If the national guard stops the rioting, looting, and arson there will be no need for citizens to arm themselves to protect their towns from Democrats.

That won't happen...at least for maybe a half a century. Even if the POTUS were to sign an executive order on disarming the public, the National Guard and local police would have to first be replaced by leftist-types. What you leftists in La-La Land don't understand is that in the "fly-over States" military-folk, sheriffs, and police brass would refuse to enforce those kinds of orders. Only you suckers would have to comply. Sucks to be you.

They have no right to try to disarm them.  So people would likely defend themselves and their rights with lethal force.  Just like rittenhouse did.

We need solidarity, the ruling capitalist class wants us to fight each other and hate each other, it doesn't hurt them

Since they're mostly the same people, that could get quite interesting.