File Upload Form

Thanks to some help from clive. I've cleaned up the code below. Now it appears I need to do some tweaking with my submit handler as my files are still getting mark as temporary in the file_managed table. Also is there a way to stop drupal from adding the _ in front of the file extension on upload?

Form

$form['model_wrapper_container']['ios_file'] = array(
  '#type' => 'managed_file',
  '#title' => t('IOS File'),
  '#size' => 22,
  '#upload_location' => 'public://ios_images',
  '#upload_validators' => array(
  'file_validate_extensions' => array('bin aes tar'),
  ),
);

Submit Handler

function iosupload_submit($form, &$form_state) {
  // Load the file via file.fid.
  $file = file_load($form_state['values']['ios_file']);
  // Change status to permanent.
  $file->status = FILE_STATUS_PERMANENT;
  // Save.
  file_save($file);
}