PUSH UNITE Thermal Performance REVO Blue lens Backpack Additional features include an ambidextrous Size:14.5 inch Additional features include an ambidextrous fire selector and a locking bolt that provides easy access to the KRYTAC rotary hop up system The Omega Railï¾™ is a free float rail system that allows the individual operator to easily install it with the provided Allen Key and requires ZERO modification to the weapon The Push Unite lens system gets the edge on the competition with its innovative Combined with the best anti fog coatings the optics industry has to offer allows for a crystal clear vision and for a fog free experience in any condition