I favour a small efficient government

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I disagree with that assessment, and further observe that you have not even attempted to answer my question as to why the framers and authors of the 2nd didn't selectively ban gun sales back then if that would have been proper interpretation of the Constitution and 2nd Amendment.

You proffered the reasoning that that would have been the proper interpretation of the Constitution and the proper actions of a small and efficient government. So why didn't the authors have done just that, back when government was far smaller and far more efficient?