Flyswatter? Or, badminton racket?
That will take out a few. And so will the next shell. And the next. And all the shells out to a maximum of, say, 30, for a Saiga.
NOW WHAT?
Now that you have taken out about 90 of them, let's say, what about the other 910 of them still descending towards you?
They will have to shift to a non-metallic fabrication in order to make this an effective weapon.
A magnetic field could neutralize a metallic swarm, for example.
Another means of neutralization would be an RF jammer, like a ‘Mr. Wizard’ like device that troops in Iraq used to use to detonate IED’s.
Using this for surveillance or biowarfare would be an excellent principle use, however.
Essentially, this would be active vectoring of an agent or device against a target.
This could revolutionize assassination of high value targets.
One of the issues would be self-destruction. The nano-bot would ideally be consumed chemically on contact with skin or a mucous membrane. It wouldn’t matter that the biological agent were present as long as the vectoring bot were gone.
If you made these slightly radioactive, you could attach these bots to a car, or to a person, and track the low-level radiation signature by satellite, perhaps even through most residential and commercial construction. A bunker may shield enough signature to mask it.
The other aspect of this is that you could precisely measure the radiological signature AND quantity such that it would be tough to decoy and divert once you’ve attached the swarm to a target.
This would also NOT be caught by current bug detection countermeasures, but it would be caught by a Geiger counter, though using a Geiger counter isn’t currently something used in sweeping.
You could only use this radiological tracking bit for a while before you could use the same technology to track swarms remotely.
Fans, a pool of water, a storm, and other things would make trouble for something like this.
Flyswatter? Or, badminton racket?