The StA409 Keyzer is a Helghast weapon and is the successor to the StA-52 Assault Rifle used in the first war, and the new standard rifle for Helghast forces. The StA409 continues with Helghast weapon design tradition, favouring volume of fire over accuracy with a high rate of fire. While the Keyzer features a smaller magazine than its previous incarnation, it is also vastly improved in terms of recoil and bullet spread. The new motorized drum magazine also allows for a faster reload, since the magazine lock will automatically move into place when the magazine is pushed in.

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