It's no secret that miniature red dot sights (MRDS) mounted on pistols are blazing a path toward the future. I've been carrying them on various carry pistols for the last 20 months. I have no plans to go back to irons because the benefits are too numerous, especially if you're dedicated to practice.
During the last 20 months, optic manufacturers have been working toward developing and enhancing a better sight. Almost all MRDS were originally designed for use on long-guns, generally as secondary roles. Companies did not anticipate that these would be mounted on reciprocating pistol slides that transfer far greater G-forces through the circuitry of the optic.
Trijicon's Ruggedized Miniature Reflex (RMR) has become one of the most popular MRDS options. Based on their own testing, Trijicon engineers felt that the RMR's electronics (specifically the battery contact of their LED powered sights) could be improved. Hence, a new model is now available. It's called the RM06 RMR Type 2 and it features upgraded electronics and a battery contact designed for semiautomatic pistols.
My preferred RMR is the RM06, which is a manually adjustable, LED-powered sight with a 3.25-MOA dot size. The controls are mounted on either side of the protective hood and are quick to adjust if needed.
The RMR is machined from a block of aluminum, and the hood of the sight is designed to transfer energy from a hard impact down the side of the hood walls into the base, which minimizes the chance of cracking or dislodging the lens. The area between the emitter and the glass is stepped down to reduce glare. A plethora of power options and dot sizes are available to suit your desires.