Pretty sure it's guns_T
It also makes sense since to make players white you remove body_T.
Also think about it:
-guns _T (guns_Texture)
You want to remove the texture to make it white. Also dont delete the file just rename it to... let's say "gunss_T". just add a letter, and when you want it back remove the letter.
Hope this helps.
*EDIT:* Also there is "_SND" wich is sound. it all adds up. (Just thought you should know this)