Fair Question, it's not a red dot, actually it's a
Holosun HS507C-X2 Pistol Green Chevron Sight- with ACSS Vulcan Reticle.
the reticle is a 10 MOA Chevron (think upside down V). I was very surprised when I went out the first time with this setup. I saw a Rabbit at 45 yds and put the top point of the chevron on the rabbits head. The point of impact was exactly where I aimed. I told my son it was a lucky shot. As the day went on I saw another rabbit at 60 yds and same result, then a squirrel at the same distance and the same result again! I'm shooting the Zan .219 diameter 28 gr at 940 (first shot after fill). They are awesome and I can't say enough about how easy the Holosun is to use. It's seems very pricey for this type of sight but it is outstanding compared to anything else I've tried. I like so much I just bought another for my .22 Sidewinder Compact-