It's a generic status icon for weapons that I made for NW3.
What I do is to take a screenshot from the weapon sideways rendered completely as black in a white or blue background (the background color can be any except black), open the icon above and the screenshot in photoshop, remove the background from the screenshot (make it transparent) and reduce it to fit the icon template.
Then I paste the reduced screenshot as a new layer there, add a gray stroke effect around it (close to what UT weapons also have), then I save it as an indexed .bmp file.

From there, I put it in a Icons folder in my package, and I import it as:
#exec TEXTURE IMPORT NAME=MyWeaponIcon FILE=ICONS\MyWeaponIcon.bmp GROUP=Icons MIPS=OFF LODSET=0

And in the defaultproperties:
Icon=MyWeaponIcon
StatusIcon=MyWeaponIcon

From there you should have a working weapon icon like the ones from UT.
(NOTE: obviously doing it from a weapon screenshot is optional, you can add whatever you want to that icon, I just mentioned the way I did it to be close to the way the UT ones are done)