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Given these last weeks, who doesn’t know what an AR-15 is?  Who hasn’t seen the mind-boggling stats on the way assault rifles have  flooded this country, or tabulations of accumulating Newtown-style  mass killings, or noted that there are  barely more gas stations nationwide than federally licensed firearms dealers, or heard the renewed debates over the Second Amendment, or been struck by the  rapid shifts in public opinion on gun control, or checked out the disputes over how  effective an assault-rifle ban was  the last time around?  Who doesn’t know about the NRA’s  suggestion to weaponize schools, or about  the price poor neighborhoods may be paying in gun deaths for the present expansive interpretation of the Second Amendment?  Who hasn’t seen the legions of stories about how, in the wake of the Newtown slaughter,  sales of guns, especially AR-15 assault rifles, have  soared, ammunition sales have  surged, background checks for future gun purchases have  risen sharply, and gun shows have been  besieged with customers?