Maybe the NRA doesn’t represent all gun owners, but it certainly represents me. I don’t necessarily agree with everything they lobby for, especially their occasional endorsements of vermin like Harry Reid, though I understand their adherence to acting like a single-issue organization that looks at everything through the lens of the 2nd amendment and nothing else, but I do feel that so often the NRA has done the heavy-lifting on issues that matter most to me as a gun owner’s that others wouldn’t do, didn’t do, or didn’t do effectively. That is why I’m an NRA Benefactor Life Member and proud of it.
I think you're right and I think it is this myopia that causes the NRA to oppose Article V.