I would argue that they are a match for what government officials and their personnel have.
1st, those government people are citizens too, with wives, children, relatives and friends who desirte to live in freedom. it is likely that in any such confrontation, those opposing government tyranny will have some help and that there will be fighting amongst those in the government itself. Through such means, some of that equipment will certainly be in the fight on the side of the citizenry fighting for freedom and be employed by those who know how to use it.
2nd, and even more importantly, those government personnel and their toys have to be supplied with food, ammunition, shelter, etc. Logistics is a real pain when there are no front lines and you are surrounded on all sides by individuals with rifles and the skill to use them at range.
In such a scenario, while it would be costly, those who are fighting for their liberty, their homes, their wives and children would make the sacrifices necessary to eat up and own the logistics train and again own the heavier equipment and supplies.
As Freeper Travis McGee has said, and to which I assent...
My vote is on the side with the 10,000,000 hunting rifles.
But, that's outside the scope of Amendment II. ;O)