I bought a Vortex Strikefire with the high base for AR 15's. Gives a lower 1/3 co-witness. The Vortex SPARC comes with a base that can be set up for absolute or lower 1/3 co-witness. Both of these are built with AR users in mind.
Other red dots are not set up for AR's with front sight bases, so you may have to buy a riser to get the dot to the height that you want. Don't know anything about Eotech, ACOG or the other high end optics.
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