Problem with Animation Layers

Hi
I watched few tutorials, I read documentation, but my layers don't work. I have two layers: Base and Weapon. In Weapon there is only animation of holding weapon, which is connected to Any State and Entry. I want it to be played at the top, so iI dragged "Weapon" Weight to 1, set Blending to Additive, dragged "Weapon" over the Base layer, but it still doesn't work. Any ideas? I'am completely new to Animation in Unity.