The Leupold Mark IMS Integral Mounting System was designed to directly mount your rifle’s Mil-Spec 1913/Picatinny to raise the scope and push it forward. This eliminates the need for risers or specialized optics with shortened eye relief. The Mark IMS is available in different ring sizes and in either Black or Dark Earth finish. All Leupold IMS are tested to endure the rigor of the field and are backed by Leupold’s Lifetime Guarantee.