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In most states, buyers fill out a federal form that the gun dealer keeps in his shop. In restrictive states, for some guns, buyers need to provide references.
Gun stores are busy since the school massacre in Newtown, Conn., revived concern about gun laws. Shops like Blue Ridge Arsenal in Virginia are sold out of some models, but are a gathering place for training and target shooting.
The Bureau of Alcohol, Tobacco and Firearms hasn't had a permanent director in six years. President Obama called for confirmation of his nominee as part of his gun-safety proposals.
Democratic Senator Richard Blumenthal of Connecticut joins us to talk about his new proposal to curb gun violence -- background checks for the sale of bullets.