Features:

Designed with same features with standard BUIS(Back-up Iron Sight) and new advantages
Gives the tactical shooter a dependable, fast-deploying back-up sight system
Multi-Aperture design. 4 Aperture sizes in one with easy adjustment
Knurled aperture wheel turns easily in both directions
Folds down and stays flat when not in use
Locked in place firmly with knurled nut. Installs in seconds
Easy to turn knurled windage adjustment wheel
Fits onto picatinny rails on flat top ARs.
Made of heavy duty high quality steel
Anodized in matte black finish
Color: black
Weight: 58g