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Back-up irons (sights) are the fold down variety that mount on the pic rail. They fold down to allow for optics and are used as back-up in case the optic fails. A popular example would be Magpul Back Up Iron Sights.
MOA is Minutes of Angle. You can look that one up. As far as the MOA dot.......a 2 moa dot covers a 2inch area of your target at 100 yards. A 3moa dot covers 3". A smaller dot is more precise, a bigger dot is easier to see.
@100yards, 1"=1 moa
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22lr, 20 gauge, 8mm Mauser, 35 Remington, 30-06, 5.56x45/223, 9mm, 380acp
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