Samson Evolution Keymod AR-15 Aluminum 12.37'' Rail Black. Being lightweight and durable allows the Samson Evolution Series to offer the perfect upgrade for 3-Gun competition shooting law enforcement and military personnel or weekend enthusiasts. Rail accommodates most piston systems. KeyMod versions of the Evolution Series do not include accessory rails. Includes: Thermal bushings Specifications for Samson KM-EVO-1237 Evolution Keymod AR-15 Aluminum 12.37" Rail Black: Mfg Item Num: KM-EVO-1237 Supplier SKU: 92448 Category: STOCKS AND FORENDS Type: Handguard Firearm Type: AR-15 Firearm Model: AR-15/M16/M4 Material: Aluminum Finish: Black Features: Stainless Steel Bushing Features of Samson KM-EVO-1237 Evolution Keymod AR-15 Aluminum 12.37" Rail Black: Free-float Thermal bushings clip to any Mil-spec barrel nut Relieved for most gas piston systemsNo need to remove front sight base Rail includes integrated anti-rotation tabs 1913 Picatinny Mil-spec Precision laser engraving Forms continuous top rail Samson 01-03015-01: Evolution Keymod AR-15 Aluminum 12.37'' Rail Black