Saw this story this morning. Pretty cool. Also, the rifle is using an XLR Enterprises Chassis.
http://deadspin.com/5883203/this-looks-like-a-fortified-snipers-nest-at-the-super-bowl
http://deadspin.com/5883203/this-looks-like-a-fortified-snipers-nest-at-the-super-bowl