For use with flattop uppers AND a KAC RIS/RAS (not FF RAS or RASII).
This rail mounts to the receiver, extends over and mounts to the top of the RIS/RAS to provide a more continuous mounting surface. It is also intended to support the bbl and forend during sustained fire. Doesn't free float the bbl though.
Has a ARMS #40 style BUIS built into it. Also has a front mounting point for a PEQ-2A (if you're lucky enough to own one).
$175 shipped and insured.
I can email pics if you like.
MO or Paypal.
*Sold, thanks for looking