The exchange between the 12-year-old students at Deer Park Middle Magnet is the third gun-related incident in county schools since the academic year started in late August, including a shooting at Perry Hall High School that left one student seriously injured.
Christel McCormick said she was apprehensive as she walked her seventh-grader home after the school in Randallstown let out Friday. She said the bullet incident came a day after the school had a bomb threat.
"It's gotten to the point where I'm ready to pull my child out," said McCormick, who also has a child who attends New Town High School in Owings Mills. "They need metal detectors in all schools."
Meanwhile on Friday, Baltimore County Police Chief James Johnson and County Executive Kevin Kamenetz announced that the county would distribute free gun locks to residents in response to the gun incidents.
"We have an obligation to be proactive," Johnson said at a news conference at the county's Franklin precinct in Reisterstown. "We know [the locks] work, and they're very, very effective. … They'll go a long way in making our community a safer place."
At Deer Park Middle, a school resource officer, acting on a report by a student, found six bullets about 9:45 a.m. Thursday in the pockets of a pair of pants left on a bench in the gym locker room. The boys were charged as juveniles with various handgun-related violations, police said.
Police do not identify children charged as juveniles with crimes.
Police said they have no indication that the boys planned to harm students or staff at their school.
The gun was legally registered to a man who lives with the boy who traded the gun for the Xbox. The boy brought the gun to the second boy's home, where police found it in the backyard Thursday.
No charges have been filed against the man who owns the gun, police said. The gun was locked and not operational with the lock in place, but the weapon wasn't kept in a secure place, according to authorities.
County residents who own guns can get up to three locks each by visiting any police precinct or the Public Safety Building in Towson. The Baltimore County Police Foundation donated $4,700 to help the county buy 2,000 locks that work with most handguns and long guns.
Johnson has emphasized the importance of securing guns as the county has dealt with the incidents. Maryland law requires that gun owners secure loaded firearms from children 15 and younger, but Johnson said the department would continue to urge residents to lock up unloaded guns as well, even though the law doesn't require it.
Gun owners must show proof that they are county residents to get a lock. When they visit the police, an officer will demonstrate how to use the lock.
"This has been a very difficult start of a school year," Kamenetz said of the incidents.
Kamenetz said the cases were not about gun owners being "simply careless."
"They were caused by owners who were being idiotic," he said.
In a September incident at Stemmers Run Middle School in Essex, a 13-year-old boy brought a loaded handgun to school, which he used to threaten his teacher and classmates. No one was injured.