Fully adjustable ghost ring sight on a Picatinny-style rail. Configured specifically for the Silver Eagle M13 tactical shotgun, this sight allows for a greater range of elevation than the original, an important feature when shooting varying slug loads. Remove the rear mounting screw from the original one-piece rail with open sight and slide it off. Slide the new rail on, secure the screw, and installation is complete! The ghost ring sight is adjustable for windage and elevation, and can also be moved forward or aft on the rail for desired eye relief. The sight may be removed completely simply by turning the mounting knob on the left side, and the rail may then be used to mount a scope, flashlight, or any other accessory. To use with our Sporter and new Express Pump models, simply secure the rail by tightening the set screws.