Holosun Low Mount for HS403BCNC machined aluminum 1 3 riser mount designed to work with standard Picatinny rails. The product is anodized in a black matte coating and fitted with an Aimpoint Micro mounting standard footprint for mounting HS403B red dot sight and variants. 1 3 Co Witness construction guarantees to hold the red dot above or in line with the iron sights, while the solid design ensures exceptional zero retention.