The NcStar MAR4S Quad Rail is designed to replace standard AR-15 hand-guards without the need for gunsmithing or modifications. This model measures 6.7 inches in length and features a black hardcoat anodized aluminum construction, which provides resistance to corrosion and ensures durability.Key FeaturesInstallation: Installs easily in minutes with no gunsmithing required.Customizable Rails: Removable weaver style rails allow for the attachment of forward grips, flashlights, lasers, and other rail-mounted accessories.