NcStar AR-15 Quad Rail system is designed to replace your standard AR-15 hand-guards installing in minutes with no gun smithing or modifications required. The removable weaver style rails are customizable so you can attach forward grips, flashlights, lasers, or any other type of rail mounted accessories. It is constructed of hard anodized aluminum to prevent corrosion for lasting durability.This model is 6.7 long and has a black anodized finish.