Gun used in Oregon elementary school shooting was birthday gift from shooter's mom, sources say

TL;DR

The 16-year-old shooter's shotgun was a birthday gift from his mother, purchased legally for recreational use.
The shooter killed three children and a teacher at Silver Rail Elementary School, wounding two others.
The victims included children aged 5, 8, and 11, and a 25-year-old teacher.
The shooter, a former student of the school, was killed by a bystander who intervened.
No motive has been provided for the attack.
Investigators are examining the shooter's digital footprint.

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