It may be a small percent but you have to realize that in a guerrilla war there are no compounds, no strong-holds, just small bands of "soldiers" making hit and run attacks on the leaders of the groups of opposing military. I could sit in my home looking like one of the sheeple and then at night I could slither down to within 200 yards of a military encampment shoot once and be back home in a short time. If you "take out" the leaders then the followers have no one to tell them what to do.
They will not be fighting for their free Obama phones and welfare checks, they will be fighting for something that is more important than their lives - freedom. Freedom to be self sustaining people with rights that prevent discrimination because of religion, because of property ownership, freedom from unlawful search and seizure, and their other rights that have been so mutilated that they no longer exist.
Do I think this war is inevitable? No! and I hope it can be avoided through the use of the ballot box but right now that box is being stuffed by those who like to be taken care of, they like the things that the government does to keep them "safe"; even if it means that they lose their rights and freedoms. There is a minority (large or small) that views the government infringements of their rights as a path that will lead to oppression of the worst kind. They will fight but not on a battlefield but from the tops of buildings, from behind trees, from points of cover and then disappear into the night or the crowd. One shot to remove the leadership, one shot to disable communications, one shot and then gone.
The military can use their drones, armored vehicles and space-age tech but it is difficult to pick out one individual and remove just that person without killing lots of others. Those tactics will just make more freedom fighters. People will not tolerate the killing of family members and friends as "collateral damage" in the cities and towns across the USA. Very quickly the members of the military will be reminded of their oath to protect the constitution and some will switch sides. They may do so overtly or covertly but they will switch. They will form communication lines that are free from surveillance and aid in coordinating strikes that do the most to take away from the government supply chain and aid the freedom fighters.
The media will try to blame it on domestic terrorism but no civilian targets will be hit. It is hard to call the killing of military commanders in the field, under warring conditions, terrorism.
People may be rounded up and imprisoned but the fighting will only grow. It will continue until the last freedom fighter is dead or imprisoned or until people realize what is happening and change their position. Either way, those who do believe that freedom is more valuable than their lives won't have to live under the control of an oppressive government.