The diamond-shaped housing in each of these Alpha Tactical Diamond Folding Iron Sights provides an easily-attainable point of aim that will increase your shooting accuracy. Each of these AR 15 Iron Sights made by Alpha Tactical feature a locking system that keeps the sight securely in place and remains zeroed while your weapon is in use. These AR Sights are incredibly easy to install with the proprietary clamping system that attaches to all Mil. Std. 1913 Picatinny Rails. When you want to put the sights away, simply push a button and fold them down.