This is a Trijicon RMR it's the RM07 (6.5 moa adjustable)
Thanks for the information. Do you adjust the size very often or do you run it with the max 6.5?
Size is not (directly) adjustable - brightness is.
For some people, boosting the brightness can cause the dot to "bloom" (i.e. appear bigger and fuzzier) though.
Also, just my thoughts but the 6.5moa dot is perfect for defensive use. Very fast to pick up. You do sacrifice a little time at distance for precision shots but nothing like you do when shooting with irons.