C-MORE Systems new free floating handguard system enhances barrel accuracy and features four M-1913 specification mounting rails for accessories. The computer designed ventilation system allows for enhanced barrel cooling. It is CNC-machined from aircraft alloy, and its unique design allows for accurate rail indexing.C-More part number QRR. Appropriate for all flattop and fixed carry handle mil-spec rifles with 20" barrels. To see all features of this handgaurd go to: http://www.cmore.com/quadrail.html Asking $150.00 shipped.