The Samson Customizable Rail sections are designed for the Evolution series handguard systems. Constructed of 6061 aluminum and finished with a mil-spec hardcoat anodizing for durability. Each rail section includes the necessary mounting screws and backer plates for installation. These rails are machined to Picatinny specifications and will accept any sight or accessory you want to mount on your forend. Available in 2" (Package of 2), 4", 6", and 8" lengths.