This is a used Mk18 rail in black. It does exhibit finish wear but there are no chips, cracks, or other damage. It includes barrel nut. It is missing 3 of 6 mounting bolts and 1 of 6 side screws as shown in photos—hence the lower price. It does mount completely solidly despite these things. Mounted QD adaptor included as in photo. Any questions please ask. Price is OBO. CONUS shipping only.