Definitely semi-automatic, magazine-fed. I'm not real familiar with the one gun mentioned, but it was the object of some controversy because it fires a small, fast bullet, capable of piercing some level of personal-protection vest.
The media made a big deal of this fact at the time the gun was introduced, despite that virtually any rifle fires a round that defeats most vests.
Now, this explains why he was so accurate!
‘In the center of the table was clear-plastic packaging from a Laser Max brand pistol sight. Authorities have said one of the pistols Hasan used in the attack was outfitted with a red-laser sight.’