From the press release ….

XS® Sight Systems, in collaboration with Lone Star Armory, will introduce the XTITM (Xpress Threat InterdictionTM) AR-15 angle mount sights at the 2012 SHOT Show in Las Vegas, Nevada next week. The XTITM with XS® Express Standard Dot Tritium front, and White Stripe rear, are back-up iron sights designed for quick acquisition in CQB situations.
The result of extensive field testing the XTITM AR-15 Angle Mount prototypes were put through their paces by police firearms instructors, SWAT and patrol officers, as well as combat-seasoned former military professionals.
Here is what Police Firearms Instructor, Officer Michael Moore had to say about XS® Sight Systems’ New XTITM AR-15 Angle Mount Back-up Iron Sights.

“Magnified optics are great at distance but can be a hindrance when engaging threats at close range. The addition of your new sights to a weapon allows the officer to have the best of both worlds. They can engage a target with precision at distance and still be able to quickly engage a threat at close range. While testing these sights we had several instructors and officers engage targets at ranges from 7 yards to 50 yards and everyone was able to keep all rounds in the center of the target.

These new offset sights are another great innovation from your company and I have had to threaten bodily injury to be able to keep somebody from taking them off of my rifle.”

MSRP of $150.00