From: Richard Mann

Sometimes optics break. And, sometimes you need to shoot things with an AR that are too close for you to use your optic, particularly if your optic has magnification. An option is to have open sights that co-witness with your optic but these can be distracting. They also work best with zero magnification optical sights. XS Sights has developed an ingenious solution that will work on any AR with a full length rail. These sights are calledXTI™ (Xpress Threat Interdiction™) AR-15 angle mount sights.

more