[RedMDer]

That is not an AR-15. I reviewed that part several times and the picture is too blurry to narrow down what type of weapon that is. It doesn't look like a shotgun.
I haven't seen anything that points to an AR-15 being found in the school. Only a mention of spent .223 rounds. My thought was some type of weapons that are easier to conceal on approach to the school.

[Drew68]

I haven't seen anything that points to an AR-15 being found in the school.

Have you looked? It's all over the news. Lanza forced his way into the school with an AR-15, a Glock 10mm and a Sig Sauer 9mm. He killed the children with the AR-15 and shot himself with one of the handguns. The police have not released what handgun he used. The police found a shotgun in the trunk but have not released the details of make and model. In time, the police will release all the details of this crime.

I'm not making this stuff up.

Maybe something like this:

Lanza didn't use a Beretta .22LR. You seem to have issues accepting the truth?

[jjotto]

The AR15 is not an assault rifle, and the universally identified “Bushmaster .223” used is basically an AR15.