Ruger's SR-556 was tested with Insight Technologies' new Mini Red Dot Sight (MRDS), a lightweight ruggedized reflex sight that mounts to any MIL-STD 1913 rail. Available with both 3.5 MOA (pictured) or 7.0 MOA dot sizes, the sights also possess MOA positive click windage and elevation adjustments. Weighing just 0.85 ounces, the lightweight sight makes it a natural for tactical use. Its top loading battery compartment ensures no change of windage during a battery change. The MRDS uses a single 1632 battery that Insight claims will last up to a year in the automode.