The SPRIII was designed as the next evolution of the iconic Mk12 Special PurposeRifle. Features a fully ambidextrous lower that enables the shooter to operate rifle mechanisms without moving dominant hand from the grip; rifle length gas system with MK12 gas block is built to Naval Surface Warfare Center Crane Division specs; 15" RIS III Rail with M-LOK and sling attachment points; full-length ARCALOCK bottom panel to maximize versatility and modularity compatible with M-LOK, ARCA and ARCALOCK accessories; Timney Armorer's Series Two-Stage, Curved, non-adjustable trigger; 18" DLC-coated MK12-profile barrel delivers accuracy and durability.