New photos show the alleged White House Correspondents’ Dinner gunman snapping off a selfie minutes before the feds say he opened fire during the assassination attempt.

A memo submitted by the government Wednesday shows Cole Allen taking the snapshot in his Washington Hilton hotel room while armed to the teeth with weapons, including a knife, and several accessories … and he took it less than 30 minutes ahead of allegedly charging into the lobby outside the WHCD.

The image shows Allen smirking while posing in the mirror, sporting a sheathed knife, a shoulder holster, pliers, wire cutters, and a small leather bag “consistent in appearance” with the ammo-filled bag he allegedly had on him when he was apprehended … according to the doc.

The memo says the pic was taken around 8:03 PM Saturday night … and it was 8:30 PM when he allegedly tried to crash into the hotel ballroom in an attempted assassination of government officials.