Thank you for viewing. This item, a 500, is now available as it has been upgraded to a 600. Please feel free to use it. It is an anti-lock joint. It has been used very little and has been covered with a protective tube, so there are few scratches. Only noticeable scratches are shown in the photos. The butt cap and mouth cap are also included. Please check the photos and only purchase if you understand the item's condition.