I think this should put an end to YOUR speculation. At about the 50 second mark he (CT STATE POLICE PAUL VANCE) discusses the weapons USED as well as what was found in the TRUNK OF THE CAR
http://www.dailymotion.com/video/xvzvkl_police-conn-shooter-had-hundreds-of-bullets_news#.UPQjbKyDmSo
I’d rather not watch a video, I rarely do, what did it say?