My gun vanishes when i aim down sights, near clip plane doesnt seem to work?

This is for a FPS i am prototyping. I have created two cameras, one for the charecter and one for the gun, aiming down the sights. When i begin to aim down sights my gun vanishes, i have changed the value for the near clip plane many times trying to find a value which works but with no avail. Any suggestions as this is the only thing stopping me from continuing. Many thanks

you have to restart the editor for clipping settings to apply.