Ok, found some promotional images. Two posts in a row here, since the forum won't let me post more than four images at once:
Tekna 9mm and Tekna Burst, a burst-firing version with an extended mag. These are probably Mark 23s, since it says "Mark 24" on the slide. Can't read the 9mm's slide, but I have a bigger image of the burst version; it had "Cal 45 auto" stamped further back.
The mysterious Vekesk Micro. Note that Dark Sector has a unique approach to throwing brass in the wrong direction; Hayden has right-handed guns, but the "Glaive" weapon his infection gives him forms from his right hand, so after he's infected he shoots with his left.
Hammer 1895. Pretty certain this is a Webley named after the Nagant M1895. It shares ammo with the M14; I guess that's the Nagant name kicking in, using the "all cartridges of the same calibre are interchangeable" rule to fire 7.62x51mm NATO instead of 7.62x38mmR. Because it's a revolver, this also magically becomes 7.62x51mm NATO
Magnum ammo.