Daniel Defense M4A1 RIS II FSP Free Float AR-15 Handguard - Quad Rail - 12.25" - FDE
Details
The Daniel Defense RIS II M4A1 FSP Handguard in Flat Dark Earth is one of the toughest and most effective free float rail systems available for AR-pattern rifles, using DD's patented Bolt-Up barrel nut system developed for the USSOCOM SOCOM II program, with a cutout for carbine-length gas systems running a fixed front sight post.
- Cutout for carbine-length gas systems with fixed front sight post
- Designed for and adopted by USSOCOM
- Quad rail design, free float
- Configurable sling swivel attachment points
- Combat-proven Bolt-Up mounting system
- Grade 8 military specification fasteners
- Aircraft-grade 6061-T6 aluminum, Type III hardcoat anodized
- Steel barrel nut, anti-rotation tabs
- 12.25" length, 1.15" inside diameter
- 17.1 oz weight
The FSP cutout is what sets this version apart from the standard M4A1 RIS II: it's built to fit over a fixed front sight post rather than replacing it, making it the right choice for rifles keeping their factory front sight. The rigid two-piece design is optimized for use with a standard M203 grenade launcher when the lower rail section is removed, and the Flat Dark Earth finish matches Daniel Defense's other FDE-finished rifles and accessories for a coordinated build.
Daniel Defense is a privately held firearms manufacturer based in Black Creek, Georgia, focused on quality and continuous improvement across its rifles, rail systems, and accessories for military, law enforcement, and civilian shooters.