Rear Sight Tactical Aluminum Picatinny/weaver Complete Match-grade by Golden Eye Tactical this rear sight is compatible with Picatinny/Weaver-style rail systems include a A2-style dual apertures with the larger Rapid Target Acquisition Aperture for CQB operations and the smaller Precision Aperture for high-accuracy aiming This sight is both elevation and windage adjustable and is constructed from rugged steel and aluminum. Improves Sight Pictures and Enhances Shooting Accuracy Rugged Aluminum/Steel Construction with Matt-Black Finish