School me on flare guns

I'm interested in a getting a few flare guns for my MAG. This is in case all other avenues of communication are down, we want to still be able to alert each other of a need and everyone comes to help out.

I know nothing about them! Looking for something that could be seen at least 3 miles away. If that is possible. Also, maybe have a few different color flares for different situations.

Maybe it is a stupid question, but I know nothing about them.

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School me on flare guns