The pump-action shotgun doesn’t shade properly, and this is true everywhere in the game since obtaining it. I have a picture to show you, but Photobucket is being difficult and I can’t upload it. Please forgive my attempt to try and explain the problem, instead.
Whenever I stand away from any direct source of light, the shotgun seems to take on a sort of light shadow of its own. This shadow, however, only starts on the right side of the shotgun, right where a 4x3 screen ratio would end on my 16x9 monitor. It looks like the shotgun is only being illuminated in a 4x3 section of my screen jammed to the far left, with the rest of it not being illuminated at all beyond basic ambient light.
I should note that this doesn’t happen if I walk next to a bright light, such as walking near my flashlight spot. This also doesn’t happen to any of the other weapons that I’ve seen so far, but I have yet to acquire the Tau Cannon, the Gluon Gun or the alien bug arm thing.
I say this may be a screen ratio thing because I’ve seen it happen in other games. City of Heroes went from a 4x3 character editor to a widescreen one, and the bright/dark filter on the background would only cover 3/4 of the screen.
edit
Oh, dear… So, posting : 3 turns into a cat’s mouth smilie? OK, then I need to swap my ratios from #:# to #x#