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it will work with a magpul rear but co-witness refers to optics lining up with the fixed front sight see article http://www.guns.com/2013/02/06/red-dot-sights-optics-scope-co-witnessing/

Yes. The A2 Front sight post is the same standard height as 99% of the available front and rear "flip Up" sights Vernon. It will work work the Magpul rear sights perfectly.