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The RIS III Rail Interface System from Daniel Defense builds on the successful design of the RIS II two-piece rails, which have been used by U.S. Special Operations Command since 2006. As well as maintaining the free-float barrel design, robust aircraft-grade aluminum construction, and uninterrupted upper rail platform of the RIS II, the RIS III also incorporates new M-LOK attachment points. There are seven M-LOK attachment points along the handguard, as well as QD swivel attachment points on both sides. The design is compatible with M203 and M320 grenade launchers (when the lower rail section is removed, for the 12.5 and 13.0 FSP options). The handguard is secured to the upper receiver via a six-bolt bolt-up system utilizing grade 8 military specification fasteners. The RIS III is finished with Mil-Spec Type III hard coat anodizing and is backward compatible with the RIS II bolt-up system, utilizing the same barrel nut and bolt-up plate. The RIS III upper rail is fully compatible with the RIS II lower rail, allowing M-LOK attachment on the upper and Picatinny attachment on the lower.