The owner of a gun shop that legally sold a rifle to the Newtown 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.
Laguercia is scheduled to be sentenced Nov. 14.
The Associated Press has reported Nancy Lanza bought from Riverview a Bushmaster rifle used in the December shooting by her son. Adam Lanza killed his mother at their home and then killed 26 people, mostly first-graders, and himself at Sandy Hook Elementary School.
Authorities say the charges Laguercia pleaded guilty to were not related to Nancy Lanza's purchase.