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I would recommend the 5 MOA SRO for a defensive shotgun. I'm an avid USPSA shooter and most guys in open and carry optics run a 5 to 6 and sometimes larger MOA dots. This is because it picks up significantly faster than a smaller dot for most people. The argument is that you can turn up a smaller dot and make it appear larger. This is true, however, for many people it's detracting because it "blooms" the dot. I personally hate this and prefer and crisp round dot that isn't glaring bright and spikey looking. Also, a 5 MOA dot is only about an inch or so at 25 yards so it's more precise than the shotgun will ever be.

5 MOA is the way to go. The idea to start with a smaller dot and brighten it so you get a bigger MOA is pretty backwards. Not only does it have that blooming effect as mentioned above, but also it kills your battery life.

I just purchased the Scalarworks mount and the Aimpoint RDS for one of my Benellis. I will let you all know how that combo works out.

First impressions are great. Size is phenomenal. I can see why some friends in my circle are dumping their T-2 and RMRs for this. The walls of the optic kind of disappear once you peer through it. The phone capture on the last picture was hard to do, so it gives an illusion of a fuzzy dot but it is in fact very crisp. There is a very faint blue tint to my eyes and it is on par with the T-2. This tint is also confirmed with some users on arfcom.