If this technique is a distraction for anyone for whatever reason I would advise against it. The small benefit is not worth any sacrifice in speed or accuracy. It's only useful if it provides you with an advantage.
"We all got it comin"....Will Munny
Well it's kind of like a person with good vision and no astigmatism wondering why someone with astigmatism is seeing a shooting star or snowman instead of a distinct red dot.
So, at 25 yds (75 ft), 1 foot equals less than one degree of angle. Look at a picture or clock on your wall about 7-8 feet away from you. Cross your eyes so you have two images (double vision). When I cross my eyes, the distance between the two images is about 4-5 feet depending on how hard I cross my eyes. That's about 30 degrees of eye misalignment.
Not everyone's eyes are aligned perfectly when one eye is occluded, so a small amount of drift/misalignment - less than a degree, can result in one foot at 25 yds. When both eyes are open, they compensate so you don't get double vision. However, as we get older, our eyes can fatigue more easily. Ever been really tired and had trouble focusing? When I was much younger, I couldn't understand why my dad had to take his glasses off to thread a needle. Now I have to do the same. I can't focus on the front sight of my handgun with my normal glasses anymore etc.
If you're don't experience it, you're fortunate, but need to understand that this is caused by differences in human vision, nothing to do with the optic or gun. If you can wrap your head around the different existing vision conditions that humans deal with on a daily basis, you can wrap your head around this
Added - Ok, I figured out a great experiment. Grab your rifle and turn on your red dot. Close the front lens cover, so you're using it occluded. Point it at any fixed object. Then cross your eyes. The dot will move a LOT from one side to another. Play around with some eye misalignments (crossing your eyes a little, a lot etc). See how much the dot moves? Then just think about how little it takes for the eyes to be misaligned to change the POI at distance. I hope that helps with understanding and visualizing it. Let me know how it goes.
Last edited by militarymoron; 04-29-24 at 17:48. Reason: Added more commentary
50 meters, MP15-22, Eotech, 2” stick-on target, CCI Clean.
The setup:IMG_6644.jpeg
Results:IMG_6645.jpegThe 1s represent strong eye only, the 2s are for both eyes open, and the Os are for occluded. 5 shots ea.
RLTW
“What’s New” button, but without GD: https://www.m4carbine.net/search.php...new&exclude=60 , courtesy of ST911.
Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.
Just did a rough non-firing experiment from the house with an aiming point of a gable end 50 yards across the street. Took aim with the cap closed and my support hand ready to flip it open. Every time I flipped the cap open the dot was actually like 16 inches right of where I wanted it.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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