Product DescriptionThe 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 HighlightsFree-floating barrel design helps maximize accuracy and consistencyTwo-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 receiverUninterrupted upper rail with Mil-Std 1913 Picatinny rails for optics and accessory mountingAircraft-grade 6061-T6 aluminum construction with Mil-Spec Type III hard coat anodized finish (Black)SpecsBrand: Daniel DefenseProduct Type: Rail Interface System / HandguardModel: RIS II M4A1Color: BlackMaterial: 6061-T6 AluminumFinish: Mil-Spec Type III Hard Coat AnodizedDesign: Two-pieceFree Float: YesContinuous Upper Rail: YesRail Standard: Mil-Std 1913 PicatinnyAttachment System: 6-bolt Bolt-Up System; Grade 8 military specification fastenersGas System Compatibility: CarbineBarrel Nut: Steel (for patented Bolt-Up System)Rail Length: 12.25 inWidth: 2.23 inHeight: 2.25 inInside Diameter: 1.15 inWeight: 17.7 ozManufacturer Part Number: 01-004-08001-006UPC: 852548002561Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.