You seemed to indicate not supporting removal of any constitutional rights, but perhaps I just read too much into your use of the article “a”. I apologize if I did.
Sometimes I feel as if really basic context is just overlooked in the hurry to respond. I naively assumed that the context of gun rights was fairly well established, and that I didn't need to be explicit about it.
That said, at present there are no constitutional rights that I would support being eliminated - I think we should keep all of them. Even so, nothing I've said suggests that they cannot be removed, only that I don't support removing them.
Obviously they can be struck off, otherwise alcohol would still be illegal in the US.