SWEP Texture Error!

Thanks to all who read this,
I’ve recently been having a problem with my weapons in Garry’s Mod. Not all of them, but certain ones, such as the CS:S Desert Eagle, and custom ones like the M82 and AK-47. A sample picture can be found here:

As you can see, there is a black triangle on the side, and a black area where the chamber is. Could this be related to a console error I am getting (FS: Tried to size NULL filename!)? Any help would be greatly appreciated!

add -dxlevel 81 to the command line. Otherwise, just put up with it.

Ugh, I’m wondering if that’ll be worth the visual quality decrease. Thanks!