Our Omega Rail 9.0 and 12.0 will fit over a low profile gas block on a barrel with a carbine lenght gas system. Our website used to state that this was not recommended as the the sole purpose of the Omega Rail was to be able to add a free float rail system to your rifle without any gunsmithing or modifications to your rifle required. Obviously to install the Omega over a low profile gas block requires that you pull the FSB, Handguard Cap completely off your barrel.
S/F
Joe
I just looked on their site, and I can't find anything about this.
I currently run their 9" rail over a low profile gas block.