I was wondering if such a pistol can exist?

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A protest control pistol that can easily be switched between two firing modes: shooting many pellets over a wide area and shooting just one. If so, how far in the future can this be a reality?
 
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It can be done right now, there's just little reason to make one.
 
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Thread 'Need help understanding particle physics and quantum physics'

So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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