Great for use with most AR-height red-dot sights, the Vortex Strike Fire 1 - 3 x 30 Magnifier features fully multicoated optics for maximum light transmission. The magnifier is internally nitrogen purged for reliable waterproof and fogproof performance, and its hardcoat-anodized, machined-aluminum construction is tough to withstand use over time. A push-button design engages and disengages the flip mount, allowing the magnifier to lock in place. Vortex Strike Fire 1 - 3 x 30 Magnifier - Scopes at Academy Sports