"Multiple sources told ESPN.com that an argument commenced during a card game on the team's overnight flight back to Washington from Phoenix on Dec. 19 and escalated into a heated exchange between Arenas and Crittenton. The Wizards had Dec. 20 off, but sources say the hostilities resumed Dec. 21 in the locker room on a practice day.
Sources say that Arenas, in response to what was said on the flight, placed three guns he owns on a chair near Crittenton's locker stall and invited him to pick one before practice on Dec. 21. Sources said that Crittenton subsequently let Arenas know that he had his own gun. "
Having read that, which sounds far more likely than the two of them going gunslinger on each other, I bet Arenas ends up pleading guilty to possession outside of his home and gets a minimal sentence.