The Ready Series AR-15 Rifle is the foundational offering of the Ready Series. It combines all of the durability and reliability the Ready Series is known for with streamlined features. Featuring a 16" nitride barrel chambered in 5.56 NATO, and a 15" MLOK rail, the Base Rifle is ready for your optic of choice and a lifetime of reliable service. At ZRODelta, hard working Americans manufacture, assemble, and test each Base Rifle with pride.