Ideal for red dot magnification systems. This design features a rigid, lightweight body, compatible with many high-end optics platforms. Fits Mil-Spec 1913 Picatinny rails. Cross-slot keyway offers excellent recoil protections. Features: Designed fro AR type upper receivers 6061 T6 extruded aluminum construction MIL-A Type 3 black hard-coat anodized Rigid and lightweight Weighs 1.7 ounces Mfg: Aero Precision