Wow... This is exactly what I've wanted in an OBR:
PredatAR Series OBR
Available in both 5.56 and 7.62NATO with either 16" or 18" barrels, much lighter profile than standard OBRs.
DI, standard low profile gas blocks.
Much longer handguards, nearly cover a 16" barrel. Of note, the handguard and flattop upper are at the same height on the PredatARs, but there is no longer a continuous top rail segment that bridges them together.
0 MOA top rails on both guns.
5.56 is under 6 lbs, 7.62 is under 8 lbs. Very good weight numbers.
Rough screen cap showing the 7.62 version with 16" barrel:
YouTube video link
ETA: Corrected spelling, added info on handguard