ZRODelta Range Ready LVOA Rail Black Medium. It is the customers responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16?. Federal NFA regulations are applicable to this item. Specifications for ZRODelta Range Ready LVOA Rail: Manufacturer: ZRODelta Color: Black Last Chance: Yes Package Contents: ZRODelta Range Ready LVOA Rail ZRODelta 7048-0025-9000: Range Ready LVOA Rail Black Medium