I agree with jaxvid that there's no need to openly attempt to disarm the American people when the PTB have gotten everything they've wanted and more through other means. The U.S. has already been conquered from within ideologically and demographically. Letting Americans keep their pistols and rifles is no big deal; comparatively they're now about as effective as the rocks the Palestinians throw at Israeli tanks. The technology the government has is fearsome; all it would take is a few demonstrations of it against some American rebels, an updated version of the extermination of the Branch Davidians in 1993, to cow all but the survivalists in the middle of nowhere into submission.
The system gives the impression of being omnipotent and omnipresent, but it's true that it can only be so many places at any given time. The only thing that might be effective would be prolonged and widespread guerrilla resistance such as targeted assassinations of elites, blowing up key access roads, targeting the grid, etc., but I don't see it happening here. Americans are too fat and dumb, and utterly fractured when it comes to understanding what's actually going on and why.