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Two eyed shooting. Almost movie quiet. Sounds like a small nail gun.

http://www.youtube.com/watch?v=fZnL_d4NogE

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That is part of the environment I talked about above. Take the same setup somewhere else and it can be significantly louder.

Schemelba

You are referencing the bendon aiming concept. (BAC) It is one of the biggest benefits of the trijicon ACOG. It was my most influential factor. But it's all based on a specific field of view, otherwise none of it works

One of the ways you teach shooters to shoot with both eyes open with a red dot is to tape over the side of the site away from the shooter. You can see the red dot but not see through the site. This forces the shooter to keep both eyes open to see the target and allow your brain to superimpose the two images over each other.

It takes a little practice but soon you get used to it and can take the tape off.