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The intact bullets all point to one firearm. Until they found the empty case, they didn't know what round it was. At the beginning, all they had was a .224 bullet that fits eleven different cartridges. When they found the piece of brass, they started to report that it was a military round. The only military round that takes a .224 bullet is a military 5.56/civilian .223 Remington. They have not reported if there were any markings on the case that narrow down the type of firearm and whether it's a pistol, bolt action or semi-auto rifle.

Just bear in mind that the only case they found, was the .223 at the school. No one is sure of any of the others, besides, that case could have been a plant. There are no witnesses that for sure pinpoint the location of the shooting that took place at the school. I mean, someone could have gone out there the nite before, and matted the ground and left the clues. The shot that actually got the kid, still could have come from somewhere else.