Police were called to Grover Washington Middle School on East Olney Avenue just before 11 a.m. for reports of a student with a weapon.
The school was placed on lockdown for about an hour while investigators searched the building.
Officers recovered the gun and took two students in for questioning.
The incident comes just a day after a gun discharged in a bathroom at E. Washington Rhodes Elementary School, according to police.
The Chief of School Safety, Kevin Bethel, said a 7th grader fired the gun in the second-floor bathroom at E. Washington Rhodes Elementary School. No one was hit by the gunfire, and the child ran from the school after the gun went off.