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My irons and Aimpoint are co-witnessed on my M-4, both for work and the one that I built.
All of my shotguns only have beads, I can't imagine needing anything more than a bead or ghost ring on a shotgun. The exception is slugs, as I do have a Hastings slug barrel for one of my 870's that is scoped, but that is for hunting, not anything inside of a house. My "tac" shotgun wears only a tritium bead and a flashlight. The whole purpose behind co-witnessing is planning on your red dot going down and using the iron sights as a backup. If you are planning on a shotgun being a primary weapon, you might need a new plan. Speaking from experience, we use them for breaching, then they get slung on the back and the carbine goes back into use. If you are using a shotgun to defend your house, spending your money on a flashlight that you can use with the shotgun is a much better investment than a reddot.
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