How to make a gun hand in 3d game, image or model 3d?
Image is easy. Draw or render one, load it as a texture and blit it to screen after rendering the scene. Using a 3d model for it isn't very difficult either. The fps-example does exactly that just without a visible hand (it's weapon only). All you have to do is to create a hand/weapon-combo in a modeller and place it at the camera's location just like the example does it.