The Warne Vapor 1-Piece MSR Scope Mount is a perfect solution for getting your AR-15 style rifle up and running with a new scope. The cantilever style base give you a little more eye relief when shooting which is a convenience. The superior clamping surface area provides a sure hold on picatinny style rail. Specifications and Features: Country of Origin: United States of America Elevation: 20 MOA Extended: Yes Finish: Matte Black Height: MSR Height Material: Aluminum Piece: 1 Style: Picatinny Tube Diameter: 30mm