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The RIS III Rail Interface System from Daniel Defense improves on the battle-tested two-piece RIS II rails used by U.S. Special Operations Command since 2006. The RIS III system maintains the proven free-float barrel design, durable aircraft-grade aluminum construction, and uninterrupted upper rail platform of the RIS II, while reducing weight and adding versatility by incorporating the popular M-LOK attachment system. The handguard features seven M-LOK attachment points along its length and integral QD swivel attachment points on both sides. The RIS III 12.5 and 13.0 FSP also allows for attachment of M203 and M320 grenade launchers. The system includes Grade 8 military specification fasteners and a Mil-Spec Type III hard coat anodized finish in either FDE or Black. The RIS III is backward compatible with RIS II bolt-up system, utilizing the same barrel nut and bolt-up plate. It is also fully compatible with the RIS II lower rail, enabling M-LOK attachment on the upper and Picatinny attachment on the lower.