Investigators said they were called to the home on Kingsway Drive last Wednesday for a report of a breaking and entering.
According to a police report, Bret Ellmers' said the rifle was left leaning against a gun safe the day before in the garage, which had been left unlocked. Bret Ellmers told officers he and his son had left the rifle in the garage after going target shooting. The report does not say whether the weapon was loaded.
The gun, a gun case, and a GPS unit were taken. The total value of the items was put at $1,100.
Ellmers spokesman Thomas Doheny says the congresswoman was in Washington when the rifle was stolen but declined to discuss details, citing the ongoing police investigation. He added that, as a mother, Ellmers is concerned that the rifle was left unsecured.
"Her family is very big on gun safety and she wants to get to the bottom of this herself," Doheny said.
Ellmers is a political conservative aligned with the tea party. In the 2012 election she was endorsed by the National Rifle Association and other pro-gun groups.
The police report says there had been no other break-ins in the residential subdivision where Ellmers and her family live. The serial number of the stolen rifle has been added to a national database used by law enforcement to track firearms.