LaRue Tactical LT660-HK Aimpoint Micro Optic Mount Provides Lower 1/3rd Co-witness with iron sights when using HK Height iron sights Precision-machined out of bar stock aluminum Matte black anodized to provide a durable non-reflective surface finish The locking LaRue Speed Lever provides outstanding return to zero; the optic can be removed, and replaced, without loss of zero. Guaranteed Comes complete with replacement mounting screws with wrench, QD adjustment wrench, vial of blue Locktite and Instructions.