Fresno Police were patrolling the area near Roy and Fig Avenue because of Thursday's murder and other gang-related shootings.
Officers found 20-year-old Rashyid Boyd with a backpack.
Because of Boyd's Fresno County probation status, they searched the backpack and found he had a loaded semi-automatic handgun.
He was arrested and booked into the Fresno County Jail on several charges including possession of a loaded firearm.