Featuring a rigid, lightweight design, Aero Precisions' Ultralight Extended Scope Mounts complement many high-end optic platforms. These scope mounts are designed to fit Mil-Spec 1913 Picatinny rails with a cross-slot keyway that offers excellent recoil protection. The Ultralight Scope Mounts free you from unnecessary bulk, providing one of the lightest mounts in the industry. Rear ring is pushed forward 1" for better eye relief Designed for AR type upper receivers 6061 T6 extruded aluminum construction Rigid and lightweight Weight: 3.07oz Mfg: Aero Precision