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All the weapons used in the Columbine shootings were either assault weapons or illegal weapons.
The TEC-DC9 9-mm is officially classified as a assault weapon.
"After the Cleveland School massacre, the TEC-9 was in California's list of banned weapons. Following its use in the 101 California Street shootings and the Columbine High School massacre, California amended its Assault Weapons Control Act to ban firearms having features such as barrel shrouds (like the TEC-DC9.)"
The other two guns used by the Columbine shooters were sawed off shotguns. If you look at their pictures in your above link you will see they are very illegal sawed off shotgun's.
Most mass murderers use assault weapons (and perhaps also other illegal and criminal looking guns, like the 2 sawed off shotguns used by the Columbine shooters.)
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