camera problem + short video of issue

I began with a FPS and got a issue with the camera if i turn up or down,some Gameobjects like parts of the weapon or the hand of the player turn of.

Here is a short video of the issue : Video of issue

On your camera, look at Clipping Planes. set it to a lower number like 0.001

As you can see,the weapon doesn`t go back or to the front if you move it,it must be a bug.