Rendering the gun in an FPS

What’s the best way to render, for instance, the gun in a first person shooter. That is, to say, an object that will stay in the same place relative to the screen at all times.

I’m sure this is a pretty simple problem. Thanks for any suggestions.

[b]

I’m sure this is a pretty simple problem. Thanks for any suggestions. [/b]

why don’t you ask this in the forum for “pretty simple problems” ? (beginner forum)
or maybe: http://www.opengl.org/resources/tutorials/index.html