Daniel Defense - MK18 Rail Interface System II, RIS II (FDE)

The Daniel Defense MK18 RIS II Rail Interface System was specifically designed at the request of U.S. Special Operations Command (SOCOM) for the SOPMOD II program. This battle-proven rail system delivers uncompromising performance by allowing operators to free-float an M203 grenade launcher without additional components or special tools—thanks to its innovative two-piece design.

Crafted from aircraft-grade 6061-T6 aluminum and finished in a rugged Flat Dark Earth (FDE) Type III hard coat anodized finish, the RIS II offers enhanced durability, accuracy, and mission versatility. It features uninterrupted Mil-Spec 1913 Picatinny rails for reliable accessory mounting and a patented 6-bolt Bolt-Up System for secure installation to the upper receiver.

Key Features:

• Designed for the SOPMOD II program by request of USSOCOM
• Two-piece design enables attachment of M203 grenade launcher by removing lower rail
• Free-floating barrel design enhances accuracy
• Constructed from 6061-T6 aircraft-grade aluminum
• Battle-tested 6-bolt Bolt-Up System with Grade 8 Mil-Spec fasteners
• Mil-Spec Type III Hard Coat Anodized finish in Flat Dark Earth (FDE)
• Continuous Mil-Spec 1913 Picatinny upper rail platform
• Compatible with MK12 Low Profile Gas Block

Specifications:

• Product Weight: 14.1 oz
• Rail Length: 9.55"
• Width: 2.23"
• Height: 2.25"
• Inside Diameter: 1.15"
• Barrel Nut: Steel (for patented Bolt-Up System)
• Gas System: Carbine
• Free Float: Yes
• Continuous