I saw this thread and immediately made another batch of popcorn.
First thing: Don't equate the pistol RDS with a shoulder arm with an RDS. You don't those 4 points of contact with a pistol, so it's not an easily acquired aiming point. Especially when you have a draw and aim a handgun quickly, udner stress, while both you and the target are moving.
Been using RDS on pistols for 30+ years. Great invention for target shooting and hunting. As far as accuracy goes, they are a bonus, provided you don't have an astigmatism. As eyes age, that happens, and the red dot becomes some kind of fuzzy barbell or asteroid with a tail. At age 64, I shoot irons as well as red dots at this point.
For carry guns, stupidest idea ever.
First thing: Don't equate the self-defense use of a pistol RDS with a shoulder arm with an RDS. You don't have those 4 points of contact with a pistol, so it's not an easily acquired aiming point. Especially when you have a draw and aim a handgun quickly, under stress, while both you and the target are moving.
If all your defensive engagements are at 25 yards and beyond, RDS is probably a great thing. But then you really should be using a shoulder weapon, and/or friends with shoulder weapons, and/or bodyguards.
Over 75% of LE shootings happen within 20 feet, and 50% within 10 feet. Citizen-involved shootings average even less than that. The RDS doesn't do a darn thing for you at those distances, except make you:
1. Slower,
2. Less accurate, and
3. Confused by the presence of TWO sighting systems and/or a dot you can't find
Many lethal encounters occur in diminished light or indoors. The tints that many RDS have on them - to allow you to see the dot and aim outdoors in bright light - are a real hinderance indoors and diminished light.
In a lethal encounter your main concern will be TIME. You cannot afford to be looking for something you can't find, or isn't there to begin with. The front sight on your handgun is always there, always visible in your peripheral or direct vision, and immediately available without hoping it appears.
The learning curve on the RDS is long, and the net result at close range is still not as satisfactory as hi-biz irons.
I haven't even touched on bulk, practical reliability (lens crud, battery failure, electronic failure), and weapon handling issues. All legitimate concerns and they are negative.
If a miniature glowing front sight dot could be made, well that would be something practical. As is, the RDS is just not ready for prime-time concealed carry, for 95% of potential users.
PS. In before, "Major LE agencies are all adopting it". Well, I the primary firearms instructor for one of those "major LE agencies" for many moons. The entire driver of RDS pistol issue is "qualifying" recruits with the least amount of time and ammo. Qualification is merely a legal standard, which is not the same thing being proficient. If you have to teach someone to hit a large piece of paper or cardboard at 15 or 25 yards, it's easier and cheaper with an RDS than irons.
Flame on, people! Been at this business for a long time and have tested the hell out of it.