According to the Las Vegas review, the Millers toted two hand guns and a shotgun with ammunition to the Cicis restaurant where they shot and killed the two police and then took their guns. According to the news report the couple had 200 rounds of ammunition, which to some folks is a short day at the rifle range.
Jerad Miller has family in Washington state, but lived in Indiana before moving to Nevada. Despite what the media reports or failed to report, he was sent packing from the Bundy camp when they found out he was a convicted felon. He main legal problem was with pot, and is likely one of his biggest problems.
He expressed his support for Tea Party and for the 2nd Amendment, but as far as I can tell he had not meatspace connections to either of those groups. He liked Tool and he liked the Seattle Seahawks football team.
His wife Amanada was similarly disposed as to music tastes and her political beliefs, but there is scant evidence of any personal contact other than a group called the Lafayette Area Activists, whose Facebook page went dark either last year.