abstract:A semi-automatic pistol is a type of handgun which uses a single chamber and barrel, with a mechanism powered by the previous shot to load a fresh cartridge into the chamber. One round is fired each time the trigger of a semi-automatic pistol is pulled.
Hasan, armed withtwohandgunsincludingasemi-automaticpistol, walked into a processing centre forsoldiers deploying to IraqandAfghanistan, where he killed13 and injuredmore than30.