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Short answer: Because the 2A acknowledges that right. It mentions "arms," not swords, arrows, leather whips, clubs, or whatever. A firearm is a type of tool. A musket is one version of that type. An AR-15 is more effective and efficient than a musket, but it's still the same type of tool.
A cannon is a different type of tool known as "ordnance." The 2A doesn't give you a right to keep and bear ordnance.
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