Problems with animated entity

The problem is quite simple. I have an FBX model of a gun, with animations. To be more specific, the model (named WEAPON1), has two child parts. The body (called Arm), and the cannon (Called AXIS_CANNON, which is the animated part). To import the animations, I do the following:

• First, I import the FBX into the project explorer by dragging it inside.

• I select the imported model, and in the inspector, I create 4 animations, like this:

http://i.imgur.com/4A66TyH.jpg

• Now, I drag the weapon model inside the scene.

• I create a new C# script, called "WeaponController.cs". Adding the following lines:

     private int power;
       // Use this for initialization
       void Start () {
       power = 0;
           animation.Play("FIRING");
       }
  
  
  

I attach it to my WEAPON1 entity. Then, I add the animations trough the inspector, like this:

http://i.imgur.com/F7pO1DH.jpg

I start the game, but nothing happens. No animation plays. I tried a lot of things like, for example, getting the object:

 GetComponent("WEAPON1").animation.Play("FIRING");

Or passing the WEAPON1 entity trough the inspector:

     public GameObject Weapon;
     private int power;
     // Use this for initialization
     void Start () {
     power = 0;
         Weapon.animation.Play("FIRING");
     }

With no luck. So my last chance is that you point me what am I doing wrong...

The only clue is that the console give me a few warnings telling me that I should mark my animations as 'Legacy', but I have no clue on how to do that.

Thanks in advace!