Red dot distance from eye?

Charlie

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How do you like your red dots, close to your eyes or far up on the rail? I am putting a Romeo 5 on a Ruger 9mm Carbine. As long as I get it out of the way of the bolt handle, does it really make much of a difference?
 
Doesn’t make much difference for the dot itself and you aiming. It can make a difference in your vision around the unit and that’s why most recommendations I’ve seen is to put it further out. On an AR platform, most of what I’ve seen recommend putting it as far out on the upper receiver rail, but not onto the handguard (assuming your handguard has a rail that meets up with the upper receiver’s rail). All of mine sit a slot or two back of the furthest slot on the upper’s rail (over the ejection port).
 
This isn’t the greatest pic, but as you move the unit closer to your head, you lose more of the vision around it and only see “what’s in the tube”...”tunnel vision”. I think that’s what he’s saying is tube effect.

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Yes, further away prevents tunnel vision, but the closer it is to your eye, the bigger the field of view inside window is and the easier it is to find the dot.

Try a few positions and decide what's most comfortable to you, weigh your compromises, then locktite it in place and build a 2nd rifle with a different config.
 
How do you like your red dots, close to your eyes or far up on the rail? I am putting a Romeo 5 on a Ruger 9mm Carbine. As long as I get it out of the way of the bolt handle, does it really make much of a difference?

I like further out for the reasons already mentioned.

Another consideration for your PCC is height of the base. Because the Ruger PCC has a traditional stock (assuming you aren't using a chassis of some type) your check weld will be all screwy if you use an AR height mount. Get it as low as you can. For comfort and speed of use.

I use a Trijicon RMR with the 12.9 MOA triangle in a MI low cantilevered mount. This mount separates the mount lever mechanism from the attachment screws for the optic using the cantilever design, so it is lower than comparable low/QD mounts. I can also get the optic even further out than the rails would normally allow.
IMG_20200625_084300.jpg IMG_20200625_084252.jpg
 
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What is the "tube effect"?
Thanks,
This isn’t the greatest pic, but as you move the unit closer to your head, you lose more of the vision around it and only see “what’s in the tube”...”tunnel vision”. I think that’s what he’s saying is tube effect.

View attachment 225168
This. Less like looking thru a tube, with all the vision impairment that brings for both eyes. I have never noticed any issue finding the dot. The whole idea of dot optics is not looking at the dot, focus on what you want to shoot, dot just overlays fairly naturally/intuitively.
 
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