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“Investigators said Lanza was wearing ear plugs when he fired approximately 150 rounds using a method called “jungle taping,” in which two magazines are taped together so he could re-load faster. He also switched magazines before they were empty, sometimes only shooting 15 of the 30 rounds.”
http://cnsnews.com/news/article/still-no-police-report-or-toxicology-results-sandy-hook-killer
http://www.freerepublic.com/focus/f-news/2979791/posts
From this description, using equivalent of a mag clamp, the type of particular weapons, appears the nutjob studied or was trained, maybe attending a tactical shooting seminar with mom or dad. The SIG Sauer P226 is one of the best handguns in the world, the Glock 20 also particular because harder to find ammo and more of a reloading piece for proper high powered loads. The shotty and AR more combat oriented. So someone in the family new their weapons. Should have kept Paxil boy or whatever the hell he was on away from them and sharp objects. His mental health needs to be investigated.