Completely, utterly, absolutely, and forever impossible.

How many firearms currently exist? The common answer is about 300 million in America. There's strong arguments that the number is closer to a billion. And that's just in private hands, not even agencies and on the shelves, let alone the massive purchasing activity if this were ever, somehow, made mandatory. But let's pretend its 300 million.

Now, how many different models of firearms are there? Thousands if not tens of thousands, all with slightly different parts and specs. Let's say ten thousand.

So we have 300 million firearms, in ten thousand different configurations. Lets pretend that about every 10 firearms design is similar enough to accept the same RFID kill switch. Let's also pretend the designs are evenly distributed throughout that 300 million, just for simplicity.

That puts us right at 300,000 each of 1,000 slightly different parts. 1,000 different parts that all have to be tested for a huge variety of firearms to ensure they don't change the function, even in the slightest.

Now, let's talk about how you install these parts. Can it be done by the user? No. It can't. Not for every firearm, some of which require special tooling to disassemble and assemble. But let's pretend that's only 1 out of every 100 designs. That leaves us with 100 designs, or 30 million firearms that require outside assistance to install the RFID chip.

So, you've got the design, manufacturing, testing, and installation costs to worry about. So how much is it? And who pays for it?

And none of this even comes close to explaining how you enforce installation. There's no registry, so how do you find the guns? Who pays for the part? The gun owner? Why? You're gonna force me to pay for a part that I have to then install that you tell me is a good thing? How do you know I installed it? How about the ones I can't install? I'm paying the gunsmith for that too? Why? And again, how do you enforce it? And how do you ensure I leave this thing in the gun?

Any kind of cut off or identification system for firearms is only feasible on new production models. And no company wants to be the first because of various laws that mandate that all new production will include the technology within a few years of its invention. This is an actual thing.

In a vacuum, sure, this might be a solution. The sheer staggering magnitude of implementation renders it pointless. And still doesn't address that the only people that are going to obey their RFID chip are going to be the people that weren't a problem in the first place.