Daniel Defense RIS II M4A1 Assembly – Drop-In Rail System for M4/AR-15 Carbines

The Daniel Defense RIS II M4A1 Assembly is a drop-in, free-floating rail system engineered to military specifications for carbine-length AR-15 and M4-pattern rifles. This quad-rail handguard provides a continuous MIL-STD-1913 Picatinny interface on all four sides for mounting lights, lasers, grips, and other accessories without compromising barrel harmonics or accuracy.

Constructed from 6061-T6 aluminum with a hard-anodized black finish, the RIS II installs without permanent modification to the upper receiver. The system includes all necessary mounting hardware and maintains compatibility with standard front sight assemblies and low-profile gas blocks. Heat shields protect the shooter's hands during extended firing sessions.

• Type: Free-Floating Quad Rail Handguard
• Compatible Firearms: M4/AR-15 carbine-length gas systems
• Material: 6061-T6 aluminum, hard-anodized black finish
• Rail Interface: MIL-STD-1913 Picatinny on all four sides
• Includes: Mounting hardware, installation instructions
• Use: Direct replacement for standard M4 carbine handguards