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[Half-Century Man]

6. The second amendment doesn't mention firearms.

It says arms, which implies any type of armament at all. We already have many uncontested restrictions on public carrying of many types of arms.
You may not walk down the street carrying a Katana, because you might start hacking up people. Why then, can you carry a loaded magazine fed semi-automatic firearm capable of reaching just about every person you can see at any given moment in time?

Some restrictions and prohibitions are completely valid.