What I am getting from all of this is that the question needs work.
A more useful question would be: which is more accurate on a match pistol- match-grade open sights or red dots?
OR- which is more accurate on an average pistol- Factory open sights or red dot sights?
I don't think the best open sights on a Glock G21 will get you as good of accuracy as you can get with a basic to moderate red dot on a higher end 1911-because there is intrinsic accuracy that comes from the pistol design- above/beyond the sight itself.
And then, it is useful to know what accuracy goals you have.
IF your goal is to regularly hit 4" circles at 10-15 yards in rapid presentations, then your sight needs would be different from bullseye slow fire at 25 yards.
I am entering the world of red dots, due to my failing focal ability under 4'. Front sights are blurry.
A red dot lets me see the point of aim and put it where I want it to go.
YET, I have noticed that I am able to get better group sizes with open iron sights than with red dots.
I have red dots on a Buckmark that has the scariest light target trigger I own. I don't let anyone except very skilled people shoot it, as there is almost no takeup, no overtravel and the trigger is about 2lbs.
I put a red dot on it, and I hit what I want, but- I feel like I can get smaller groups if I use the open FO front sight- it just takes me longer to line everything up.
There is so much science that goes into fine-tuning target sights that it has more adaptability to various needs than a 3mil or 2mil red dot. Even a 1 mil red dot at 50 yards feels HUGE.
Some of the dot options on my cheap buckmark red dot are just so large that I can only see using them if I were hunting a rabbit [or something larger] at 10 yards or so.
The basic dot is fine for fast action shooting, but I prefer iron sights for precision.
I am hoping I can last another 10-15 years before I HAVE to go red dot for handguns- and then I'll simply have to adapt to being ok with 5" groups instead of trying to achieve 1" groups of 8 in .45 at 10 yards.
I don’t know which red dot optic you’re using on your Buckmark. Many red dots on pistols seem to have dots with sizes of ~3 MOA or ~6MOA with adjustments of 1 MOA per click. There are also a number of options higher and lower, but those two seem to be the most popular. Taking 3 MOA as an example, at 50 yds it will cover 1.5” on the target. Even the 6 MOA will cover 3” on the target. I’m not sure the thickness of the front sight on your pistol, but many front blades are thick enough to cover far more than what I just described. That doesn’t get into the fact that a shooter that is capable of 1.5” at 50 yd is pretty darn rare in my experience. Heck, you generally have to go to some pretty expensive pistols to get accuracy guarantees at that level. While a red dot might seem visually to cover more than you might think otherwise, absent an extremely thin front blade I don’t see how it is limiting accuracy just by the design of the dot.
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