Authorized Distributor AIMPRO Tactical Ghost Ring Rail   Ghost Ring Rear Sight in a Rail with standard aperture rear sight.  Optional Fiber Optic Rear aperture in production and expected by 12/15/2013     Currently Back Ordered    $ 129 Our New Ghost Ring Rear Sight in a Rail was designed to be a Direct Replacement for your Mossberg Factory Ghost Ring Rear Sight.  Compataple with factory Ghost Ring Front Sight or UPGRADE to our NEW Fiber Optic Front Blade. *** Not Compatible with “SPX” (LPA) or “Blackwater Edition” (XS) sight systems Fully Adjustable for Windage and Elevation Steel Protective Wings and Aperture Direct Fit for Factory Drilled and Tapped Mossberg Model 500/590/M590A1 Receivers Shown with Optional Fiber Optic and Notch Rear Apertures and NEW Fiber Optic Front Blade Approximately 4” overall length.  Mil-Spec 1913 Picatinny Rail.  Mounting Hardware Included. Combine this NEW Rear Ghost Ring Sight with our NEW Fiber Optic Front Ghost Ring Blade for the Optimal Sight Picture. Don’t have Mossberg Factory Ghost Rings on your Model 500/590 or M590A1 ?  Let us install them for you. See All our AIMPRO Tactical Ghost Ring Sight Packages for Mossberg on our Products Page