Daniel Defense  |  SKU: RSR-DD01-004-02383-006

Daniel Defense - RIS III 13" FSP M-LOK Rail Black

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Description

SOCOM-Proven Heritage with Front Sight Post Compatibility.

The Daniel Defense RIS III Rail Interface System continues the legacy of the battle-proven RIS II—trusted by U.S. Special Operations Command (SOCOM) since 2006—while reducing weight and adding modern M-LOK versatility. This 13" FSP (Front Sight Post) configuration is engineered for rifles retaining a fixed front sight, delivering a free-float barrel design with an uninterrupted upper rail and Mil-Spec 1913 Picatinny interface.

Machined from aircraft-grade 6061-T6 aluminum, the RIS III FSP features seven M-LOK attachment positions along the handguard and integral QD sling swivel attachment points on both sides. The proven 6-bolt Bolt-Up System and Grade 8 fasteners provide exceptional rigidity and repeatability under hard use.

  • Free-floating barrel design enhances accuracy and consistency
  • FSP-compatible design for rifles with a fixed front sight post
  • M-LOK attachment at seven positions along the handguard
  • Integral QD sling swivel attachment points on both sides
  • Aircraft-grade 6061-T6 aluminum construction
  • Uninterrupted upper rail with Mil-Spec 1913 Picatinny interface
  • Proven 6-bolt Bolt-Up System with Grade 8 military-spec fasteners

Backward Compatibility

  • Backward compatible with the RIS II Bolt-Up System
  • Utilizes the same barrel nut and bolt-up plate as RIS II
  • RIS III upper rail is fully compatible with RIS II lower rail

Important Installation Note

  • M203 hangers may interfere with pinned and welded muzzle devices
  • Daniel Defense recommends installation by a qualified gunsmith on firearms or URGs with pinned and welded muzzle devices

Technical Specifications

  • Rail Length: 12.96"
  • Weight: 16.38 oz.
  • Width: 1.95"
  • Height: 2.16"
  • Inside Diameter: 1.34"
  • Barrel Nut: Steel (patented Bolt-Up System)
  • Gas System Length: Carbine
  • Free Float: Yes
  • Continuous Upper Rail: Yes

Finished in Black, the RIS III 13" FSP is ideal for duty, tactical, and preparedness-focused AR platforms that retain a fixed front sight while demanding modern modularity.

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Frequently Asked Questions

What makes the Daniel Defense RIS III 13" FSP M-LOK Rail unique compared to other rails?

The Daniel Defense RIS III 13" FSP M-LOK Rail stands out due to its SOCOM-proven heritage and modern M-LOK versatility. It is specifically designed to maintain compatibility with rifles that have a fixed front sight post, offering a free-floating barrel design that enhances accuracy. The rail's construction from aircraft-grade 6061-T6 aluminum ensures durability while keeping the weight down, making it ideal for tactical and preparedness-focused applications.

How does the M-LOK system enhance the functionality of the RIS III 13" FSP Rail?

The M-LOK system on the RIS III 13" FSP Rail provides seven attachment positions along the handguard. This allows users to easily attach a variety of accessories such as grips, lights, and lasers without adding significant bulk or weight. The modularity of the M-LOK system ensures that your rifle can be customized for different scenarios, whether in tactical operations or preparedness settings.

What are the benefits of the free-floating barrel design in the RIS III 13" FSP Rail?

The free-floating barrel design of the RIS III 13" FSP Rail significantly enhances the accuracy and consistency of the rifle. By eliminating contact between the barrel and the handguard, the design reduces potential interference that can affect shot precision. This is particularly beneficial in long-range shooting and tactical scenarios where accuracy is paramount.

How does the RIS III 13" FSP Rail maintain compatibility with the RIS II system?

The RIS III 13" FSP Rail maintains backward compatibility with the RIS II system by utilizing the same barrel nut and bolt-up plate. This means that users with existing RIS II setups can upgrade to the RIS III without needing to replace these components, ensuring a seamless transition while benefiting from the new features of the RIS III.

What considerations should be taken when installing the RIS III 13" FSP Rail?

When installing the RIS III 13" FSP Rail, it is important to note that M203 hangers may interfere with pinned and welded muzzle devices. Daniel Defense recommends that installation be performed by a qualified gunsmith, especially on firearms or upper receiver groups with such muzzle devices, to ensure proper fit and function.

What is the significance of the 6-bolt Bolt-Up System in the RIS III 13" FSP Rail?

The 6-bolt Bolt-Up System used in the RIS III 13" FSP Rail provides exceptional rigidity and repeatability. This system, combined with Grade 8 military-spec fasteners, ensures that the rail remains securely attached under hard use. This is crucial for maintaining zero on optics and other mounted accessories, especially in demanding tactical and preparedness scenarios.

How does the RIS III 13" FSP Rail support tactical and preparedness roles?

The RIS III 13" FSP Rail is designed to meet the needs of tactical and preparedness roles by offering a robust and versatile platform. Its compatibility with fixed front sight posts and M-LOK modularity allows for a wide range of accessory configurations, enhancing the rifle's adaptability to various situations. This makes it suitable for both professional and civilian users who require a reliable and customizable firearm setup.

What materials are used in the construction of the RIS III 13" FSP Rail?

The RIS III 13" FSP Rail is constructed from aircraft-grade 6061-T6 aluminum, providing a balance of strength and weight reduction. This material choice ensures the rail can withstand rigorous use while keeping the overall weight of the rifle manageable. The use of high-quality materials is essential for maintaining performance and durability in both tactical and preparedness environments.

How does the uninterrupted upper rail benefit users of the RIS III 13" FSP Rail?

The uninterrupted upper rail on the RIS III 13" FSP Rail provides a continuous platform for mounting optics and other accessories. This design feature eliminates gaps or breaks in the rail, allowing for greater flexibility in positioning accessories for optimal performance. It is particularly beneficial for users who require precise placement of optics and other tactical gear.

What are the integral QD sling swivel attachment points on the RIS III 13" FSP Rail used for?

The integral QD sling swivel attachment points on the RIS III 13" FSP Rail allow for quick and secure attachment of slings. These points are located on both sides of the rail, providing versatility in sling configuration and ensuring that the rifle can be carried comfortably and securely. This feature is particularly useful in tactical situations where quick transitions between carry positions are necessary.