The five murder shots came from a Kel-Tec 380.
Depending on which version you believe. I was going with one of the two versions you cut&pasted.
Ersland also kept a much larger pistol in a nearby drawer, which he was able to retrieve, a Taurus Judge revolver. At that point, the second robber took off. However, the other robber was now getting up off of the floor, despite the head wound.
Ersland emptied his clip into the chest of the wounded robber, who turned out to be 16-year-old Antwun Parker.