*points at Juutis and AgentArrow*
So anyway, I'll try to make as much sense of this as possible.
I have a large texture that I'm trying to map to a gun model I'm working on.
The texture itself is yet unfinished; the only part currently on the image is the magazine/clip map.
So, here's the problem. In my model, the magazine/clip group is just a rectangular box; i.e. it has 6 sides. When I assign the material and everything, I go into the texture coordinate editor to map it correctly.
However, I am only able to map it from one side (e.g. front, back, left, right, etc). I can't seem to map all the sides to a different part of the texture.
Here's a screen of my TCE, showing where the texture pieces should go:

I know your instant reaction would be to tell me to RTFM, but it's honestly been no help to me.
Any help with this would be great, it's holding up my dev schedule.
Edit: oops... that's a leaked image right there xD