Mass murderer Adam Lanza learned everything he knew about firearms ... from his mother.
Adam's mom, Nancy Lanza -- who was Adam's first victim -- was an avid gun collector who reportedly bragged to friends and neighbors about her weapons and took her son to several firing ranges to teach him how to shoot ... in the months leading up to his deadly assault.
One of Nancy's neighbors, Dan Holmes, told the NY Post ... Nancy was a gun enthusiast ... an avid collector ... often taking her kids to the gun range, infusing them with her obsession with firearms.
Adam used several different guns when he opened fire on Sandy Hook Elementary school earlier this week ... all of which were registered to his mother.
See also
Connecticut School Shooting -- Reporters Swarm Wrong Ryan Lanza
Connecticut School Shooter -- Media May Have ID'd Wrong Guy
James Holmes -- Aurora Massacre Shooter Tries To Commit Suicide in Jail
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