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The RIS III Rail Interface System from Daniel Defense is based on the two-piece RIS II rail system that has been battle-tested and used by the United States Special Operations Command (SOCOM) since 2006. However, the RIS III has been designed to be more versatile and lightweight by incorporating M-LOK attachments. This design includes the same free-float barrel, uninterrupted upper rail platform, and durable aircraft-grade aluminum construction as the RIS II. In addition, the RIS III has seven M-LOK attachment points on the handguard and integral QD swivel attachment points on both sides. The result is a reliable rail that is built on proven technology, accommodating accessories that use the M-LOK attachment system.

Here are the features of the RIS III:

- Free-Floating Barrel Design increases accuracy
- M-LOK Attachment on 7 Surfaces Along Length of Handguard
- Two-Piece Design allows for the attachment of M203 and M320 Grenade Launchers (RIS III 12.5 & 13.0 FSP Only) when Lower Rail Section is removed
- 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 (Available in 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 attachments on the upper and Picatinny attachments on the lower.