Barrier Defense AR-15 7″ Two Piece Drop-In Quad Rail Hand Guard This hang guard is constructed of extruded 7029 T6 aluminum and given a hard coat anodized finish for durability. It is also “T” marked on all four sides. The rails can accommodate a broad spectrum of modern sighting arrangements, including any number of rear iron sights, red dot sights, or rifle scopes. Technical Information: Material: 7029 T6 Aluminum Finish: Hard Coat Anodized Comes with the Barrier Defense lifetime warranty! ****Know your states laws when purchasing gun parts.****