I have an AT with the low rail (non - night vision).
Indexing off the pin that goes through the bolt safety shroud, I'm getting exactly 1 inch.
I was sort of surprised that this was the same measurement I got with my Tikka T3x rifles, with that particular aftermarket rail that was installed on them - considering the difference in maximum barrel thickness (1.15" vs. 1.22"). Probably need to recheck the measurements with the scope removed one day.
What measurements are you getting?
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