Material doesnt come up in texture list for UV I'm using nodes to texture my pistol a bit, however, I've colored each material seperatly so I can assign specific parts to the pistol, however, none of them show up in the list of materials, I'm worried because I'm doing this for a game, and I'm scared that they will not show up.
You can't use the uv editor for assigning materials.  All you need to do is go into edit mode, select what you want to color, click the material you want to assign it, and click assign.