I just sold one of my 6920's to a buddy at work.  I have an AAC m4-2000 that I am currently running on my other 6920 and want to get something a little shorter to use it on.   I'd like to get an SBR, no shorter than 12.5 and without a FSP.  I've been leaning towards Larue's OBR lite, but then I came across the smartgunner deal, and can get a DD 12.5, with 10in rail, and lower and all for $1067.  Then BCM has the BCM SS410 12.5" Upper Receiver Group w/ Daniel Defense Lite 10" Handguard for $990.

I know the Larue is as accurate as it comes, but have never shot DD or BCM's 12.5 models.  Anyone that has shot either please chime in.  

If there is another SBR that you'd recommend, feel free to throw it out there.