Well, the luger has 3 models:
1. Uberpoly, used for generating normal maps for the high poly and low poly modelss. I would never UV map the Uberpoly, its only function is to bake normals. The insane polycount will never make it into a game, and be as insane to unwrap.
2. Highpoly, 1st person with extra details. Gets UV mapped and it's own Diffuse, specular and normal map 2048 x 2048. Takes some effort to unwrap and fit into a single texture space.
3. Lowpoly, 3rd person with less details and more jagged. Inside the magazine and individual bullets have been axed, plus little stuff like fillets and chamfers are gone, and curves represented with fewer facets. Unique UV maps at 1024 x 1024, diffuse, specular and normal. In this case, I was able to bake the highpoly UV map onto the lowpoly map, with minor fiddling of the resulting texture.