Insurgents haven’t been able to kill a great deal of coalition soldiers even with assault rifles, never mind crudely manufactured single-shot handguns. Also bearing in mind that German Landsers weren’t strapped up with the kinds of protective gear available to western soldiers nowadays.
Even assuming there are people who could churn out UAVs in factories unmolested by the US government forces, how long is all this great stuff going to last with all the sophisticated countermeasures available to government forces?
You can argue with me all day about this, but the fact is, last time their was an uprising against a tyrannical government by the citizenry, it got slapped, and the disparity between the toys available to the government is always going to be hugely imbalanced in their favour, more so now than at any previous point in history....
So, to sum up your “argument”: the South lost the Civil War about 150 years ago, therefore no attempted insurgency will ever succeed in the US. QED.