While watching the video of the shooting Detective Jaruszalski ID's the pistol the shooter is using as a Glock 17. Later on when the police learn the shooter's identity they found out three years earlier he had purchased a handgun, a Glock 26. Yet at his trial they once again say his gun was a Glock 17. Both guns are the same caliber, 9x19 mm, but different models. The Glock 17 is a full sized model and the Glock 26 is a subcompact model.