Where are you finding this information? from what Im seeing they havent released that information yet, and whats out there are conflicting reports. I read one article that said it was pistols and there was a AR-15 in the trunk, another said he used the AR-15 and it was a saiga in the trunk.
Here you go ... the doctor did say the gun used was from a long rifle.
http://newtown.patch...school-shooting <----- in the article of the interview with the Doctor... he says the bullets came from a rifle.
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Doctors' interview that was on t.v.