



Product Description
The Daniel Defense Rail Interface System II (RIS II) M4A1 is a rugged, mission-driven free-float handguard engineered to meet the demands of USSOCOM’s SOPMOD II program. Built from aircraft-grade 6061-T6 aluminum and finished with a Mil-Spec Type III hard coat anodizing, this two-piece rail delivers a strong, stable mounting platform while helping improve accuracy through its free-floating barrel design. The RIS II’s innovative two-piece construction allows an M203 grenade launcher to be attached when the lower rail section is removed—without the need for special tools—by integrating the required components directly into the rail. It also features an uninterrupted top rail and Mil-Std 1913 Picatinny rails for consistent alignment and broad accessory compatibility. This system is intended to be used in conjunction with the MK12 Low Profile Gas Block.
Product Highlights
- Free-floating barrel design helps maximize accuracy and consistency
- Two-piece USSOCOM-inspired design supports M203 mounting when lower rail is removed (no special tools required)
- Battle-tested 6-bolt Bolt-Up System securely mates the handguard to the upper receiver
- Uninterrupted upper rail with Mil-Std 1913 Picatinny rails for optics and accessory mounting
- Aircraft-grade 6061-T6 aluminum construction with Mil-Spec Type III hard coat anodized finish (Black)
Specs
- Brand: Daniel Defense
- Product Type: Rail Interface System / Handguard
- Model: RIS II M4A1
- Color: Black
- Material: 6061-T6 Aluminum
- Finish: Mil-Spec Type III Hard Coat Anodized
- Design: Two-piece
- Free Float: Yes
- Continuous Upper Rail: Yes
- Rail Standard: Mil-Std 1913 Picatinny
- Attachment System: 6-bolt Bolt-Up System; Grade 8 military specification fasteners
- Gas System Compatibility: Carbine
- Barrel Nut: Steel (for patented Bolt-Up System)
- Rail Length: 12.25 in
- Width: 2.23 in
- Height: 2.25 in
- Inside Diameter: 1.15 in
- Weight: 17.7 oz
- Manufacturer Part Number: 01-004-08001-006
- UPC: 852548002561
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