Madbull Airsoft Daniel Defense Certified RIS II M4A1 FDE
-RIS is an abbreviation for Rail Interface System
-A sticker labeled "TAN" is affixed to this product package, but it is affixed to distinguish it from BK and represents the same color as FDE. This product has only two color variations, BK and FDE.
-RIS hand guard developed to install M203 grenade launcher without additional parts.