I only found one news source that identified the trunk gun as a Saiga shotgun.
My guess is the media hasn't harped on that because the word "shotgun" would perk up the Fudds's ears. The Obama administration and the media want to keep the Fudds apathetic and on the sidelines.
Supposedly, Adam Lanza was dropping mags left and right before any of the mags ran dry.
He was also wearing ear plugs.
Another thing I find odd was that the black Honda was towed away in the rain, that it wasn't towed to a police garage on Friday night. As far as I know, fingerprints are severely degraded when exposed to moisture. I didn't see any fingerprint powder or dust on the outside of the car. So at the least, it is shoddy police work.