After being apprehended in a furious five-day manhunt for the killer of an insurance executive in midtown Manhattan, Luigi Mangione casually told a prison guard he had a 3-D gun in his backpack and chatted with another about George Orwell’s literature, according to court testimony.

The Pennsylvania guards were recounting what Mangione shared with them under their watch following his arrest at a McDonald’s days after the slaying of UnitedHealth Group Inc. executive Brian Thompson that riveted the U.S. a year ago.

Lawyers for Mangione are urging a state court judge in New York to rule that statements he made at the time of his arrest are off limits as evidence, as well as the handgun recovered from his backpack and a diary that prosecutors say showed he planned to kill a health-care execut

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