A Nashville middle school was placed on lockdown late Tuesday afternoon after an unloaded weapon was found. The weapon, a .25 caliber, was found in a 13-year-old student's gym bag at Bailey STEM Magnet Middle School located on Greenwood Avenue. An eighth grader was taken into police custody. The student reported he brought the gun to school due to a situation outside of school.A student is said to have alerted the school's SRO of the gun. No injuries were reported.