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The Burris Optics AR-F3 Flattop FastFire Mount is a Weaver/Picatinny-style mount for the FastFire series red dot sights. It mounts onto Weaver/Picatinny-style bases and offers protection to the side of your sight while still allowing easy access to illumination controls. There are also compartments for carrying a spare battery, open-end wrench, and Torx wrench.