Sprite question

What sprites do the physgun use? I’m almost finished with my Physgun skin but I can’t figure out which sprites to modify to get rid of the blue glow/beam. I’ve spent quite a while digging in the Gmod GCF for VMT’s and in the source materials GCF for textures, but I can’t find anything.

I also tried the physcannon_blueglow1b.vtf, etc. textures but those don’t seem to be the ones.

Any ideas?

If you download a Skin of garrysmod.org you can just modify those. However I don’t know where you could find them in the GCF’s