To flesh out the question…
The 32 moa circle can be used as a training crutch to help center the optic, aka get the gun leveled so the dot is on target. Dry fire to get used to new muscle memory for the slight change in aming helps.
I have some cylee with and without the circle (32 ~ish moa ring. My edc is the 407C on my dagger S frame with the long slide (dagger x slide?) I’m forgetting the model.
I have red and green dots on various pistols and a red dot on my betetta A300. Got a GG&G adapter to co-witness the dot on the Iron sights for the shotgun, vs the pictinny stock rail.
Humans see green easier than red. Medically speaking it is part of how our eyes work (unless you are color blind).
There is some of a learning curve switching from pistol, iron sight only to a dot sight. I’m not a competitive shooter, from concealment AIWB I’m ~2 seconds to 1.78 seconds, presentation to shot on a timer running Bill drills recently.
If I can’t get live fire I do dry fire several days a week. This incorporates some dummy rounds and tap-rack drills. AKA basic pistol malfunction clearing drills.
Possibly check your local gun shop or shooting range club and look at/through what optics you can. Might sway the red vs green and weather or not you want the option for the 32 moa circle option. I will say red dots suck on orange center targets such as NRA 100 yard practice targets. Green is visible on orange, red is not.
The 407c & 507c are trigicon footprint, aka RMR. The other major footprint on full size slides is a Doctor cut. RMSc is, as mentioned for the 5.7 pistols and sub compacts like the sig 365/ Springfield Hellcat.
Carrying strong side in the 3-4 o’clock position I kept banging my optic on door ways. Lots of holsters for right handed shooters fall in this carry location.
My inner protector mindset thoughts… I 100% blame my mother sending me at age 4 to investigate stuff breaking in her house at 10 pm to 5 am, but that is an entirely different discussion. This was during the hillside strangler in Southern California issues.
Just my humble opinion being on my church safety team with the thought of using deadly force to end an active shooter threat. YMMV and your reason to carry might be different. Lots of legales played into my decision making and that can be very state or county specific. Please check your local laws, as it would be a big bummer to watch a good guy go down on technical B.S, for an otherwise use of deadly force being 100% justified.
I hope this helps!
- Joe