We're told there were four guns in Arenas' locker that were turned over to police, including a gold-plated Desert Eagle -- a gigantic handgun.
Arenas could be charged for "CPWL"-- carrying a pistol without a license.
As we previously reported, Arenas could also face assault charges stemming from the alleged gun-toting standoff with a teammate on Xmas Eve.
D.C. cops plan to bring in Washington Wizards coach Flip Saunders today for questioning. GM Ernie Grunfeld will be brought in later this week.