This is a like-new take-off from a BCM upper that was never used.
Nothing was ever mounted, so there are no marks on the exterior of the rail. On the interior where the rail makes contact with the barrel nut, there are marks from removing it from the barrel nut, which is unavoidable, and nothing that is visible when the rail is reinstalled.
$210 shipped via PP Gift. If interested, EMAIL
me. Quick sale, and won't last long at this price.