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Reliable, simple back-up iron sights (BUIS) For any AR-15.

The best way to master the fundamentals of marksmanship is to shoot "old-school": Straight downrange through a set of good ole' iron sights. But that doesn't mean you need to take up all the top-facing rail estate on your AR rifle or pistol with iron sights. Back-up sights like the models available here work by providing the irons when you need them, with a compact, folded, out-of-the-way profile when you prefer to instead use your optic or red dot. Choosing a good set of flip-up irons means no more co-witnessing or obscuring your optic's view with sight posts. 

Popular BUIS from Magpul and More

Magpul's polymer back-up iron sights are virtually indestructible and provide the same windage and elevation adjustments as a set of large, fixed irons, minus the bulk and price. They're affordable and capable of providing accurate shot groups at max effective range for just about any AR configuration, while retaining the ability to fold flat for your top-mounted optics. 

Want something even simpler? Our mini flip-up irons are perfect. They're affordable, made from aluminum, and even smaller than most other iron sights on the market. These also provide full, A2-style front and rear sight posts with full windage and elevation adjustments. 

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DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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