Good luck running that around every acre in Texas.
Impossible task, not enough equipment, and really hard to operate when someone is shooting at you.
Truth is that nobody is going to find all the guns, and we aren’t going lie down like Australia and Canada.
I don’t know the sweep of aircraft with ground-penetrating radar, but don’t be too surprised by capabilities these days.
They don’t have to run all over Texas all they have to do is make an example out of your neighbor and you will willingly submit.
Again this mindset makes it clear guns are useless for our side and we have already lost. I want to add we lost this battle a long time ago when we collectively took brute force off the table. You can't do that, ever. Diplomacy is utterly useless unless it's backed by the potential and willingness to back it up with brute force. The latter is where we failed.