Exporting items with the "Gun_" class on the MK6 doesn't seem to work. I am given the following error

However if exported in the "Hull" "Turret" or "Chassis" classes it works with no issues

Here is Unhandled exception

************** Exception Text **************
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at Tank_Exporter.frmMain.gun_cb_CheckedChanged(Object sender, EventArgs e)
at System.Windows.Forms.CheckBox.OnCheckedChanged(EventArgs e)
at System.Windows.Forms.CheckBox.set_CheckState(CheckState value)
at System.Windows.Forms.CheckBox.OnClick(EventArgs e)
at System.Windows.Forms.CheckBox.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)