The incident resulted in a 2 1/2 hour lockdown and evacuation of nonessential employees.
Along with the pictures of the gun, Channel 2 Action News also obtained pictures of bags of marijuana that were also found in the incident.
“This is the worst possible thing. A handgun going into the jail? We have got to get to the bottom of this,” said Robb Pitts, Fulton County Commissioner.
Pitt discussed his concerns about jail security with Channel 2s Tom Regan.
Authorities say inmate Kortez Hurt allegedly shot another inmate in the hand following an argument Tuesday.
Investigators said it happened on the seventh floor maximum security wing of the jail, where physical contact is not allowed between inmates and visitors.
Following the shooting, officers searched the area and discovered a five-shot Derringer pistol stuffed inside a toilet paper roll and hidden behind a ceiling panel.
Three live rounds were still inside the chamber.
Corrections officers also found nearly 20 illegal cellphones, charging devices and zippered plastic bags full of marijuana.
A source told Channel 2 several pounds of pot were seized.
Pitt said he is astonished by the jail gun smuggling and shooting, saying it posed a deadly threat to inmates, jail personnel and visitors.
He worries that some of the contraband may be carried in by rogue corrections officers and given to inmates for cash.
“Ninety-nine percent of the people, the personnel, are hardworking people. But a random search (of corrections officers) periodically would help in a situation like this, Pitt told Regan.
Sheriff Ted Jackson declined an interview request by Channel 2 Action News, citing an ongoing independent investigation.
The Atlanta bureau of the FBI is conducting the investigation.