Fortis F1 Optics Mount is designed to work in conjunction with Aimpoint’s popular Micro H1/H2″ T1/T12 as well as the Vortex Sparc II series optics. The F1 Optics Mount is designed to attach to your flat top upper receiver. Its lightweight low-profile is one of the lightest designs out there at 1.3oz. The Fortis F1 Optics Mount features an innovative design by extending the optic forward for faster target acquisition. It secures to any MIL-STD-1913 Picatinny Rail with two slotted machine screws. Offering a lower 1/3rd to your back up iron sights for a larger field of view.