How does it? Historically speaking, the gun essentially made regular peasants basically more useful than a, at that time, trained professional soldier. A metric fuck ton of dudes with rifles is better than a battalion of armored knights. Thus states started giving regular people rights.
The taking of firearms now, is, counter to the belief that it is the beginning of normal people losing their rights and power, but instead is just the formalization of what is already true. The common person has no power.
Your kvetching about gun manufacturers literally has shit all to do with that point. I know reading my posts isn't something people do on MMO-C, but c'mon man you can do better.