I have Ameriglo sights on my Glocks and my wife's M&Ps, I prefer a wide rear notch with tritium vials with no outline and a front vial with a large orange ring around it. The wife prefers the same model but with the lime green ring around the front tritium vial. The lime green ring on her front really glows when exposed to a light source for a few seconds. They may be called Spartan Operators.