The first part is only an explanation of why they think the right is necessary. The important part is the second part where they spell out what the right itself is.....the right to keep and bear arms. Not just keep them, but also to bear(carry) them. There is no ambiguity about that part, it's very straight forward. It is a constitutional right just like the first amendment, no other way to interpret that. Certain groups don't like the right so they try to find ways to limit, undermine or encroach upon it. Which is comical because that is exactly what the word "infringe" means.
What amuses me about this whole debate is that nobody is forcing anyone in this country to own a gun or carry one. If you don't agree with the second amendment then don't exercise it. Very simple. I'm really confused as to why this is even an issue. It's just something you can to if you want.