Samson STAR-C AR-15 Carbine-Length Free-Floating Rail - Standard 7in. Rail. This system of Tactical Accessory Rails from Samson features a removable lower for M203 compatibility. In addition to the Samson Carbine Free-Floating Rails we carry a full complement of shooting accessories and rifle scope mounts rings and bases as well as other product offerings from Samson. We also carry a full line of Samson accessories including rifle scope mounts accessory mounts and other tactical mounts and scope rings. We back everything we sell with a guarantee of 100percent satisfaction Specifications for Samson STAR-CX AR-15 Carbine-Length Free-Floating Rail for AR-15: Gun Model: AR15 Features of Samson STAR Carbine-Length Rail for AR-15: Carbine Length Compatible With Most Piston Systems Free Float New Take Down Pin Design M203 Ready No Need To Remove Front Sight Base Winged Clamp To Prevent Barrel Nut Rotation All Rails 1913 Mil-Spec Hard Coat Anodized Forms Continuous Top Rail 6061 T6 Aluminum Weight: 10.5 oz Package Contents: Samson STAR-C - Samson Tactical Accessory Rail System Carbine Length Free Floating Rail for AR-15 Samson STAR-C AR-15 Carbine-Length Free-Floating Rail - Standard 7in. Rail