The authorities did say they found a .223 with Lanza, along with a Sig and a Glock. The gun in the trunk was a shotgun. I have seen the Bushmaster called an M-4 and an AR-15, which are different weapons in my understanding (the AR-15 is longer, I believe), but I think it’s close enough for me to call this one done.
Here is a link: http://www.cbsnews.com/8301-201_162-57559395/conn-school-shooter-had-4-weapons/
And another: http://www.huffingtonpost.com/2012/12/16/school-shooter-adam-lanza_n_2312818.html
Paranoia is a strange thing. It is usually wrong, but not always, and thus it is hard to gauge when it is appropriate. Most of the time we worry too much, but there are rare times when we worry too little. Lacking perfect knowledge, it is a constant balancing act. Here, I failed through a lack of due diligence.
My apologies for a preventable fuck up.