You cannot ask someone "do you support gun control, yes or no?" because gun control is a relative term. I support gun control as in if you've been involuntarily admitted to e mental institution you can't have a gun. I don't support California's policy of destroying guns when the owner dies.
The better question is "[b]How much[/b] gun gun control do you support?"
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I can ask people if they support gun control as much as I want due to the amount of people who do not want any firearm regulation at all and you can't do shit about it.