So Edgecrusher (a LaRue OBR owner) and I (a high end SI-D owner) both sat down and shot each others rifles.
As you could have expected, we both liked our own rifle more... but they were each designed to fit US and only US. On the flip side, we both respected the hell out of the other rifle.
I really like the OBR... After going through all the headache to build my rifle, I look back and think I would have changed my mind had I known what I was in for. Being finished with my rifle, there's no way I'd go back.
As for a DPMS achieving OBR status... That's like saying, "Can my Nissan Frontier be as formidable as a Dodge 3500 turbo diesel?"
Sure it can... You just have to replace EVERYTHING, and start over from scratch..... OK, I'm exaggerating. You could probably make a very close clone with either the RECON or the SASS versions... but expect to make some modifications.