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Like Wal-Mart, it has reached the point where he has had to ration certain kinds of ammunition as well. He said a vast number of customers he is seeing are first-time gun buyers who want to get their supplies before any of Mr. Obama’s more ambitious gun-control proposals take effect.

Mr. Obama has outlined a package of gun controls in the wake of the shooting deaths of 20 children and six adults at Sandy Hook Elementary School in Newtown, Conn., in December that includes bans on so-called assault weapons and high-capacity magazines and strengthened background checks on gun purchases.

“They’re scared they’re not going to be able to get it anymore [and] it’s their right to be able to do so,” Mr. Hood said.

Mr. Obama’s administration has consistently emphasized that none of his proposals impinges on the Second Amendment or the Constitution, and that “gun grabs” or a national firearms registry are simply not going to happen.

“No one’s going to take my gun — no one’s going to take anyone’s gun,” Vice President Joseph R. Biden, who owns two shotguns, said this week.

“Now the question is, what is the balance between you having the right to defend yourself and the right to engage in sporting activities that are in fact totally legitimate and legal, and the kind of weapon that is outlawed?” said Mr. Biden, who also encouraged Americans to purchase shotguns rather than AR-15 semi-automatic rifles if they want to buy guns for self-defense. “We can argue about where that balance is, but there isn’t any argument that the government can, in fact, impact on that balance.”