Honestly, I forget if I got this in a build kit or off of a new upper, regardless this was purchased new and removed immediately or never assembled on a gun. This is the same mlok that comes on mr556 made by HK. Does not come with the rail nut, just the rail itself. Not interested in trades unless I can take the item(s) to a pawn shop and get more than $150. I can ship to you for $10 if you want to pay over venmo/zalle.