Ruger Mark I, II, III, IV, IV Lite, 22/45 Pistol - Modular Red Dot AdapterThe Ruger Mark I, II, III, IV, IV Lite, 22 45 M. R. A (Modular Red Dot Adapter) allow the shooter to utilize a variety of red dot sights on their Ruger Mark I, II, III, IV, IV Lite, 22 45 with one adapter. OuterImpact has gone to great lengths to assure that the fit and finish of this system are top notch. Are you looking for a low profile adapter to mount a multitude of Red Dot sights on your Ruger Mark I, II, III, IV, IV Lite, 22 45? Not only will