arms and gun animation

i have this arms and gun animation that was done in blender when i import it to unity the animation don't work do i need a script to make the arms and gun to move and reload can anyone help me on this ?

Thank You for any help on this

 

Here is some untested code.

Code (csharp):

1. function Update(){
2.  
3. if(Input.GetKeyDown(KeyCode.R)){
4. animation.Play();
5. }
6. }

Sorry if it diddnt help or worked.