Weird face colors!

I’m working on a Deagle model and I noticed a problem. If you look at the added pocture you will see that some faces have a different color. How is this possible and how do I get them the same color as the rest? I already tried recalc normals and it wasn’t working. I hope you guys can help me out!

Different color in this case would mean it’s reflecting different amount of light, the reason is not all the faces are oriented the same way. Turning on ‘shadeless’ in the material panel does not help because this option only takes effect during rendering.