A gun was found at Jacksonville's R.V. Daniels Elementary, police said.
A rusted handgun was found in rain gutter on the roof by a maintenance worker.
The gun was confiscated, and the Jacksonville Sheriff's Office was called.
No one was hurt. An investigation is underway.
The incident comes one day after a first-grader brought a gun at Golden Isles Elementary School in Glynn County.
Updated list of guns found in Jacksonville-area schools in the 2017-18 school year:
1. Sept. 28 - First Coast High School
2. Oct. 6 - Mandarin High School
3. Oct. 6 - Biscayne High School (Charter School)
4. Oct. 13 - R.V. Daniels Elementary
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