Offset Rail allows the attachment of laser/flashlight mounts, red dot sights or other accessories.Keeps accessories off to the side so they don't interfere with vertical grips, handguards, or opticsErgonomic  design gives easy access to on/off switches for Flashlights, Lasers, or Red Dot sightsHigh grade aluminum constructionSingle thumb nut secures mount to weaver/picatinny style rail