I have a great one. I cannot for the life of me remember where I found it. I am at work now and will post it here tonight. Setting it to overlay causes black borders? I can't say that this occurs with my muzzle flash. Were you using a sprite as a muzzle flash? I use a strange model, you will have to look at it. I set it to transparent and bright and that's pretty much it. The thing that used to cause black borders on my computer was using a model that had a tga skin with an alpha channel and the skin mapping was too close to the edges of the skin; but like I said, I'll post the model tonight, you may want to alter the skin for your purpose.
