The Samson Evolution Series is the next step forward in free-floating handguards. Being lightweight and durable allows the Samson Evolution Series 11 to offer the perfect upgrade for 3-Gun competition shooting, law enforcement and military personnel or weekend enthusiasts. Accessory picatinny rails can be added or removed at any of 7 positions around the rail and any place along the length of the tube. Kit includes: Thermal bushings, (2) 2" rail kits, (1) 4" rail kit, instructions and wrenches. Rail accommodates most piston systems.FEATURES: