The Daniel Defense Rail Interface System (RIS II) was designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD II program. It allows the individual operator to free-float the M203 grenade launcher without additional parts.
| Manufacturer | Daniel Defense |
| Pricing Unit | EA |
| Model | M4A1 RIS II Rail Assembly |
| UPC | 852548002820 |
| SKU | 01-004-08001 |
| Width | 4.4000 |
| Length | 14.2000 |
| Height | 4.0000 |
| Weight | 1.9000 |
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