I just sold one. It had been listed on this site and one other site. Did not take long to sell (as I had anticipated). Saw another one sell here recently.
I originally ordered a 16" barrel and I think that helped speed things along. I waited may be six weeks or so I think. If I recall correctly, the longer barrel lengths had more of a delay. If you check ar15.com (industry forum - Larue Tactical section) you can get an idea of what is shipping how quickly because some of those people are Larue fanatics who have an obsession with that type of thing like discussing their dillo collection or whatever. I like Larue Tactical and they have treated me very well, but some of their fan-boys do not have well-balanced perspective in my view.
Do consider a GAP-10 also. For what it is worth, the OBR was a very nice gun and ran very well for me. I simply wanted to go back to a bolt-gun as I felt it was more appropriate for my level of skill.