Aero's Ultralight Scope Mount frees you from unnecessary bulk, providing one of the lightest mounts in the industry. It features a rigid, lightweight design, and is compatible with AR type upper receivers with Mil-Spec 1913 Picatinny rails and has a cross-slot keyway that offers excellent recoil protection. This Extended model has a FDE cerakote finish and 1" rings. Its rear ring is pushed forward 1", resulting in better eye relief.