Families of children murdered in the Sandy Hook massacre have won access to search through killer Adam Lanza’s computer as part of their lawsuit against a gun manufacturer, according to reports.

The parents are suing North Carolina-based Remington, the company that produced the Bushmaster AR-15-style rifle that Lanza used in 2012 to kill 20 first-graders and six educators at Sandy Hook Elementary in Newtown, Conn., in less than five minutes.

Their attorneys want to see if Lanza, who also fatally shot his mother prior to the massacre and killed himself when it was over, was exposed to ads for Remington products — and a Connecticut judge on Thursday granted their request, the Hartford Courant reports.

“All the defendants want are the facts the plaintiffs have today that show Adam Lanza was exposed to Bushmaster advertisements,” said James Vogts, a lawyer for Remington.

Lanza’s computer is in the hands of state police, who have turned over some of the madman’s files to the Courant — such as a spreadsheet on mass murders and twisted screeds on his contempt for overweight people and his aversion to being touched.

Parents of nine children killed at Sandy Hook, as well as a teacher injured there and an FBI agent who responded to the grisly scene, filed the suit against Remington in 2015.

They claim that the gun manufacturer used “immoral” and “unethical” marketing techniques to glorify the AR-15’s military design — despite mounting evidence that it has become the “weapon of choice” for mass shooters, the Courant reports.

The lawsuit is set to go to trial in September 2021.

With Post wires