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For use on a .22 rifle . Difference is the eye relief
What and why are the preferences
Smaller dot in the forward position for better accuracy?
Either seems to work for two-eyes-open
I have a Burris Fastfire mounted on a Ruger 10/22 Take-Down. I have a VQ extended rail so I could mount the site well forward. Front or back, either way works well but my preference for a red-dot or hollow site is way up front.