LESS WEIGHT, MORE FLEXIBILITY-with additional features that make this unmatched short-barreled rifle even lighter, more maneuverable, and more controllable. The MK18 RIII features a fully ambidextrous lower receiver, and DD replaced the RIS II rail system with a lighter-weight RIS III rail system that utilizes M-LOK attachment instead of picatinny. Class III dealers only; all NFA rules apply. FEATURES: 10.3" chrome-lined, heavy-phosphate-coated Government-profile barrel provides outstanding maneuverability & durability Fully ambidextrous lower enables shooter to operate important rifle mechanisms without moving dominant hand from rifle grip 9.5&q Mfg: Daniel Defense