Aero Precision Ultralight 34mm Scope Mount SPR FDE. This scope mount is designed to fit AR type upper receivers with Mil-Spec 1913 Picatinny rails and features a cross-slot keyway that offers excellent recoil protection. Ultralight Scope Mounts free you from unnecessary bulk providing one of the lightest mounts in the industry. Specifications for Aero Precision Ultralight 34mm Scope Mount: Manufacturer: Aero Precision Fabric/Material: 6061-T6 Aluminum Base/Mount Type: Riflescope Ring Tube Diameter: 34 mm Weight: 4.1 oz Condition: New Country of Origin: USA Quantity: 1 Package Contents: Aero Precision Ultralight 34mm Scope Mount SPR What firearm models does the manufacturer say Aero Precision Ultralight 34mm Scope Mount is compatible with? The manufacturer suggests that Aero Precision Ultralight 34mm Scope Mount is compatible with AR-15Aero Precision APRA211312: Ultralight 34mm Scope Mount SPR FDE