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“Why is the Second Amendment right of a buyer at a gun show superior to that of a paying customer of a gun shop?” said Lawrence Keane, senior vice president and general counsel for the National Shooting Sports Foundation, the trade group for gun and ammunition manufacturers. “Prioritizing gun show checks would delay checks for gun shop owners all across America on the busiest sales days of the week.”

The effects of the proposal are not clear. Since the Newtown, Conn., school shooting rampage in December, the National Instant Criminal Background Check System had eight of its 10 busiest days through March 31, and all of the top 10 weeks for background checks have occurred since December.