NFL quarterback Tarvaris Jackson -- who played for the Seahawks last season -- is behind bars in Florida after allegedly PULLING A LOADED GUN on his wife and threatening to kill her.
TMZ Sports has confirmed ... the 33-year-old was arrested around 2 A.M. Friday morning for aggravated assault with a deadly weapon without the intent to kill.
According to a police report, Jackson pointed a loaded gun at his wife while intoxicated -- threatening to kill her -- all while their children slept in the same house.
Jackson is currently in Osceola County jail.