Build and Shoot

The iron sights for me get these weird pink (rarely other colors such as green) spots. I'm pretty bad at describing it, so here's a screenshot: This happens with the stock sights as well. Does anyone else get this?

That happened to me playing Left 4 Dead with a very old graphic card. Some surfaces had that translucent purple thing. Perhaps it's some kind of shader that your system can't render.

Try bumping down shaders
Or get an another mod. It happened to me before and I just recommend getting a new mod for it. :]

Turning off anti-aliasing did the trick. Thanks for your help guys!