And what was the time frame used?
Roughly 1/1/18 - 2/15/18. The number came from Everytown for Gun Safety, and the media ran with it.
Two were suicides, one in a parking lot one was a man in a school bathroom. How he explains is: Four times a gun was fired through a windows - A gun shot on January 4th went through a highschool window, no injuries. January 10th a shot broke a window at "a California university class window, no injuries, January 10th a bullet went through a wall at a TX criminal justice school, no injuries, on January 15th a bullet went through a dorm room, no injuries, January 25th a Mobile, AL student fired a gun on campus, no injuries, January 26th shots fired in a parking lot, no injuries. On February 5th a 3rd grader pulled the trigger on a cops gun. On Feb 8th a shot was fired in Metropolitan High School, no injuries. He has more and breaks down the shootings where there was an injury other than the shooter, there were three incidents of such.