Burris AR-F4 Mount Black. Allows the FastFire to mount at the optimum height so the red dot can co-witness with flip-up sights - can be used with aftermarket risers to customize sight height. Fits Weaver or Picatinny-style base. Metal shroud protects the lens from impact and unintentional abuse. Specifications for Burris AR-F4 Mount: Manufacturer: Burris Color: Black Fabric/Material: Aluminum Red Dot Sights-Footprint: Deltapoint Pro Attachment Type: Weaver Picatinny Optic Cut: Not Applicable Weight: 0.26 lb Condition: New Mount Type: Weaver Package Contents: Burris AR-F4 Mount Burris Forever Warranty (Non-Thermal Optics) and Three Year Limited Warranty (Thermal Optics) All Burris Optics (with the exception of Thermal products) are covered by the Burris Forever Warranty . Burris Company Inc. ("Burris Co. or "we") warrants that its Burris Optics products (nonthermal optics products) will be free from manufacturing defects for the product's lifetime from the date of purchase or delivery (whichever occurs later). Burris Co. also warrants that its Burris Thermal Optics products will be free from manufacturing defects for a period of 3 years from the date of purchase or delivery (whichever occurs later) by the original purchaser. Warranty information and warranties are supplied solely by the manufacturer and not this retailer. This retailer publishes information from the manufacturer for information purposes only and the manufacturer is solely responsible and liable for any warranty information and warranties published by this retailer. Please reference the appropriate manufacturer documents or reach out to the manufacturer directly for full warranty terms and effective dates. Burris 410347: AR-F4 Mount Black