The capabilities of the AR-15 style, compared with other available rifles, can be exaggerated ... the usual AR calibers of .223 and 5.56mm are too weak,” they said. “Common hunting caliber ...

223-caliber-sized round inside an AR-15 ... Adam Lanza took his mother’s AR-15 rifle to the school and fired 80 rounds into the bathroom. Here are the wounds that killed Noah.