AR-15-style rifles in a gun store (image via Depositphotos) The 19-year-old gunman who opened fire at a St. Louis high school on Monday, identified as Orlando Harris, was armed with an AR-15-style rifle and what appeared to be more than 600 rounds of ammunition. All of it legal in the Show Me state. Missouri, along with Kansas, reportedly has the weakest gun laws in the nation. https://twitter.com/Karrynation/status/1584962518224551936 https://twitter.com/galenbacharier/status/1584601863928025090 Tenth-grader Alexzandria Bell and 61-year-old physical education teacher Jean Kuczka were killed in the deadly attack and seven students sustained injuries before police killed Harris in an exchange of gunfire. https://twitter.com/juliareinstein/status/1584911358788771841 During the mass shooting, one student said she found herself eye-to-eye with Harris just before his gun jammed giving her time to escape. Related: 21 Dead In Texas Elementary School Shooting Numerous witnesses inside the school said they heard Harris yell, “You are all going to die!” Another told the St. Louis Post-Dispatch they heard the shooter say he was “tired of everybody” in the school. https://twitter.com/shaderoomed/status/1584617334622154752 According to the Associated Press, Harris ( who graduated from the school last year) reportedly left behind a hand-written note offering his explanation for the shooting Monday at Central Visual and Performing Arts High School. Police Commissioner Michael Sack read Harris’ note in which the young man lamented that he had no friends, no family, no girlfriend and a life of isolation. In the note, Harris called it the “perfect storm for a mass shooter.” The St. Louis Post-Dispatch has details from several who experienced the terrifying incident. https://youtu.be/GRUd5ksSL1g