Shooting gallary gun

1

Hi I am trying to make a shooting gallary, and everthing works fine. I just want to add one thing and that would be a gun, on the bottom of the screen. I wanted to know how you can move the top of the gun around. just moving it in angels.

2

is it angles like this?
If so you could use Math.atan2


onClipEvent (enterFrame) {
	this._rotation = Math.atan2(this._y-_root._ymouse, this._x-_root._xmouse)/(Math.PI/180)-90;
}