You've guessed it, im new at game-programming. Im doing this myself, with good programming skills and some 3DStudio/Blender skills. Im trying to make a 3D model of a gun turret, but I want to be able to control the turret part (gun pipe) by itself and leave the base standing still, but honestly I don't know what is required. I think I am quite familiar with the mesh system of a XNA Model, but no matter what I do I can't seem so get more then one bone in the object. This must be a familiar thing to do so Im hoping a kind soul will explain to me what needs to be done, I was hoping i did'nt have to learn eg. MilkShape or something else? What am I not seeing here? Thanks in advance.

You don't really need bones to do this kind of animation. What you need is to make the gun barrel and rest of the gun turret two separate objects/geometries/nodes/meshes. This way, you can move the barrel independently of the turret (e.g. rotate it).