1. Create a new layer
2. Give this layer to your object
3. Create a second camera under the main camera and change these settings
   1. Clear Flags = Depth Only
   2. Culling Mask = Your Tag
   3. Depth = 1

You can remove the layer out of your main camera's culling mask but it will work either way.

recommended

How to stop sticking to walls and corners

Stop weapon clipping

Blood effect when HIT