The KAC Carbine Free Float RAS (Rail Adapter System) features full length mil-spec M1913 Picatinny rails at the 12-, 3-, 6-, and 9 o'clock positions, making it compatible with any number of rail-mounted tactical accessories. The rail free floats the barrel, allowing for consistent barrel harmonics upon firing, and thus increased accuracy potential. Includes three KAC 11 Rib Rail Panels. Specifications: Total Length: 7 3/16" Picatinny Rail Length: 6 3/16" Weight: 13.9 oz. Free Float: Yes Material: Aluminum Finish: Black Anodizing P/N: 20208