Originally Posted by Riflecrank
Here is the choice insert from NECG.
A full 45 degrees forward slant is not required:

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Here it is on a .458 WM M70 Classic:

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A similar one on a .416 Dakota M70 Classic:

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The next best thing:

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Gee, one thing I've noticed over the decades is that the light-angle isn't always helpful for "illuminating" a front sight...which is why I prefer the 45-degree angle, which so far hasn't proven to be a disadvantage.

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