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BRIDGEPORT, Conn. (AP) The owner of a gun shop that legally sold a rifle to the Connecticut school shooter's mother has pleaded guilty to unrelated federal firearms violations.

The U.S. Attorney's Office said Thursday 56-year-old David Laguercia pleaded guilty to transfer of a firearm before completing a background check and failure to maintain firearms records. Prosecutors say an investigation found about 300 examples of false or misleading information in Riverview Gun Sales records.

The charges were not related to Nancy Lanza's purchase. The Associated Press has reported that Lanza bought a Bushmaster rifle from Riverview that was used in the December shootings by her son. Adam Lanza killed his mother at their home, killed 20 first-graders and six educators at a Newtown school, then killed himself.

Laguercia's sentencing date is Nov. 14.