The counterpart to the Dentler BASIS® mounting rail is the BASIS® base rail, which remains on the weapon. It is available for a wide range of rifle models and thus enables the easy mounting and changing of several optics on one rifle. The base rail is made of highly tempered tool steel and is protected against corrosion and optically refined by surface treatment. Depending on the weapon, the mounting is screwed or glued. The innovative mechanism of the clamping lever adjusts the associated BASIS® mounting rail in the front recoil groove as well as the rear positioning groove via a pull and push movement, thus ensuring absolute repeatability for a consistent shot pattern.