C-MORE Systems Tactical Red Dot Sight with Click Switch Heads Up Display for Fastest Target Acquisition Super Bright Red Dot with Adjustable Intensity and Interchangeable Dot Module Infinite Adjustment for Windage and Elevation Featuring Positive Locking Screws Polymer Body, Click Intensity Switch (12 Positions = Off, 2 NV, 1 Low Light and 8 Day light) Attaches to Colt M-16/AR-15 Rifles and Carbines, Including the M-4, With a Flat Top Upper Receiver