Current thinking on RDS mounting distance?

[Disciple]

What is the current thinking about the ideal distance to place a Red Dot Sight? Specifically a 20mm tube-type RDS, the Sig ROMEO4.


Proof that I did search but everything I found is more than seven years old and I wonder if anything has changed. If I missed newer threads please just direct me to them.

https://www.m4carbine.net/showthread...t-on-a-Flattop
https://www.m4carbine.net/showthread...ing-or-outside
https://www.m4carbine.net/showthread...orward-or-back
https://www.m4carbine.net/showthread...ting-placement
https://www.m4carbine.net/showthread...-carbine/page2

[PracticalRifleman]

Here’s how I make the decision:

I put it on the receiver where it won’t interfere with the rear sight, magnifiers, or passive NV mounts if I’m so inclined to use them. If not, then as far to the rear as possible.


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[TBAR_94]

I'm interested in what the experts have to say here, because I've always believed that where you mount the optic was more a function of rail space and keeping the gun balanced than any particular advantage in terms of sight acquisition.

[SomeOtherGuy]

I place them towards the front of the receiver (not the handguard), for two reasons:
1) Leave room for flip BUIS mounting.
2) So my field of vision is either clear through the RDS or around its outside, but minimizing any view of the inside walls of the RDS - which is not useful. (If this isn't clear, look through any small tube up close and at a farther distance, and you'll see how farther away produces less view of the inside of the tube.)

[Five_Point_Five_Six]

Far enough forward to be able to mount a magnifier between the optic and the rear BUIS.

[markm]

Agreed... as far forward on the upper as I can get it.

[titsonritz]

I mount my Mirco RDS far forward on the receiver.

[Leuthas]

I believe the Force Science Institute did a study on this very topic years ago, and discovered that average first shot times from low ready were notably faster as the RDS was mounted more forward, testing all the way out typical front sight location on the rail. There was a lot of nuance to it - I'll look for a link.

I've personally found this to be true in my experience actually training.

[Randall]

Yep, forwardmost as it can be on the receiver, but not the rail

[JediGuy]

I believe the Force Science Institute did a study on this very topic years ago, and discovered that average first shot times from low ready were notably faster as the RDS was mounted more forward, testing all the way out typical front sight location on the rail. There was a lot of nuance to it - I'll look for a link.

I’d love to read that