Depends on model...
511, 512, 551, 552 will be absolute.
553, 516, 517, 557 incorporate built-in risers and are lower 1/3.
Again, it's about where the sights are within the window when you get the proper sight picture with the irons. The dot moves on top of the front sight post with either an absolute or bottom 1/3. It's just your irons will align through the bottom 1/3 of the window or straight through the center with absolute.
511, 512, 551, 552 will be absolute.
553, 516, 517, 557 incorporate built-in risers and are lower 1/3.
Again, it's about where the sights are within the window when you get the proper sight picture with the irons. The dot moves on top of the front sight post with either an absolute or bottom 1/3. It's just your irons will align through the bottom 1/3 of the window or straight through the center with absolute.

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