The newest version of the the Fortis REV Rail is the 9CAR. It is designed for AR-15s with the carbine length gas system.
This iteration of the REV Rail has all the same features that the REV has become known for including, extreme light weight, KeyMod attachment points on the 3 and 9 o’clock sides, full rails on the 12 and 6 o’clock sides, and forward partial rails at 3 and 9 o’clock. The 9CAR sets itself apart with an front sight base (FSB) cutout that allows it to wrap around the FSB (or piston system) on the sides and bottom which can be an ideal place to mount a weapon light.
Check out the new Fortis REV Rail 9CAR.