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The Daniel Defense RIS III Rail Interface System is based on the battle-tested design of the RIS II rails which have been used by U.S. Special Operations Command since 2006. However, it has been improved through the use of M-LOK attachment which has resulted in a reduction in weight and an increase in versatility. The RIS III features a free-float barrel design, made of durable aircraft-grade aluminum and uninterrupted upper rail platform with Mil-Spec 1913 rails. Along the handguard, there are seven M-LOK attachment points, and there are integral QD swivel attachment points on both sides. These features make it possible to accommodate various accessories that use the popular M-LOK attachment system.

Here are the key features of the Daniel Defense RIS III Rail Interface System:

- Free-floating barrel design for increased accuracy
- M-LOK attachment on 7 surfaces along the length of the handguard
- Two-piece design enables attachment of M203 and M320 grenade launchers when lower rail section is removed (RIS III 12.5 & 13.0 FSP only)
- Aircraft grade 6061-T6 aluminum construction
- Battle-tested, 6-bolt bolt-up system securely attaches handguard to the upper receiver
- Grade 8 military specification fasteners
- Uninterrupted upper rail platform
- Integral QD swivel attachment points with limited travel
- Mil-Spec Type III hard coat anodized finish (FDE or Black)
- Backward compatible with RIS II bolt-up system - utilizes same barrel nut & bolt-up plate
- RIS III upper rail is fully compatible with RIS II lower rail, enabling M-LOK attachment on upper and Picatinny attachment on lower.