High-strength aluminum alloy 1913 picatinny base, attaches to the receiver with 8 screws.Compatible with both weaver-style and picatinny-style rings.Getting more out of the phenomenal accuracy of the x-bolt.Reports from shoots all across the world confirm that today's x-bolt rifle is an incredible shooter capable of incredible accuracy.For those of you looking to reach out a little bit further, this high-quality base provides you a solid lock-up to your action and an additional 20 moa of elevation so you can dial in that much more drop on your scope before you have to start "stacking" moa/mils.Specifications:Model: X-Bolt 20 MOA Picatinny RailStyle: Picatinny/WeaverMaterial: AluminumPieces: 1Mount Type: To ReceiverRings Included: No