Vortex Precision QR Cantilever Mount 30mm 2in Offset Black Medium 1.45in 8.9oz. These One Piece Rifle Scope Mounts made by Vortex Optics are precision machined from 6061 T6 aluminum which is tough enough to handle any mission yet light enough to keep you mobile in the field. For enhanced longevity the Vortex Precision QR Cantilever Scope Mount is hard coat Type 3 Mil-Spec anodized to withstand corrosive elements for a lifetime of use. Ensure your scope is properly aligned and provides generous eye relief by securing it in this Vortex Precision QR Cantilever Scope Mount. Specifications for Vortex Precision QR Extended 30mm Cantilever Mount: Manufacturer: Vortex Height: 1.45 in Gun Rail: Picatinny Fabric/Material: 6061-T6 Aluminum Offset: 2 in Gun Make: AR Platform Color: Black Distance Between Rings: 63.9 mm Tube Diameter: 30 mm Length: 5.93 in Ring Height: 1.45 in Weight: 8.9 oz Gun Model: AR-15 Width: 1.18 in Condition: New Diameter: 30 mm Finish: Type 3 Mil-Spec Anodized Country of Origin: USA Quantity: 1 Gun Type: Rifle Features of Vortex Precision QR Extended 30mm Cantilever Mount Aircraft Grade Aluminum Package Contents: Vortex Precision QR Extended 30mm Cantilever Mount What firearm models does the manufacturer say Vortex Precision QR Extended 30mm Cantilever Mount is compatible with? The manufacturer suggests that Vortex Precision QR Extended 30mm Cantilever Mount is compatible with AR-15Vortex CM-404: Precision QR Cantilever Mount 30mm 2in Offset Black Medium 1.45in 8.9oz