AR-15 Rifle Basics: Understanding Iron Sights

By Josh Wayner

There is literally no end to the number of items that can be mounted on an AR-15 rifle in some fashion, whether it’s a high-end $4,000 scope designed for extreme range shooting or a rail-mounted bottle opener for extreme range drinking. Of all the things that you’re able to stick on an AR, though, the most common and seemingly least understood are iron sights.
Most people have a basic working knowledge of what iron sights are supposed to do, but often not much understanding of what makes them work or what they’re really good for.
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Source: The Truth About Guns