My rotations aren't applied to my game object

I have a model with an armature that has a body and a gun attech to it, all his parts can be transformed/rotated/scaled but the gun rotations in specific seems to be "locked". I can rotate in Scene view but in Game view it can only be rotated if I go into "Cube.002" parented with the bone.



Here is what it look like.


And it should do this (like the other cube)


Notes: those lines(if you can see them) are in debug and basically is what i use to get an angle to apply the rotation. The cyan is for the gun, and the magenta is for the cube.

Code:

Code (CSharp):

1. void Update()
2.     {
3.         Vector3 GunPos = new Vector3(Gun.transform.position.x,
4.                                       Gun.transform.position.y,0);
5.  
6.         Vector3 BallPos = new Vector3(Ball.transform.position.x,
7.                                       Ball.transform.position.y,0);
8.  
9.         Debug.DrawLine(GunPos,BallPos,Color.magenta);
10.  
11.         float angle = Mathf.Atan2((GunPos.x-BallPos.x),(GunPos.y-BallPos.y))* Mathf.Rad2Deg;
12.  
13.        Gun.transform.localRotation = Quaternion.Euler(0,0,-angle+90);
14.     }

Update: Actually the bone that control the gun only rotates 360° of his starting rotation, so if it's in -90 I can only change the rotation in 270, 630, 960 and so on. I can't even seen it rotating.

 

Looks like there's an animation driving the rotation, which is forcing a value? I can see the character bobbing slightly.

You should also fix your mesh's scale and orientation, I'm guessing it's from Blender, it's way out of whack from Unity's.