Think you know AR-15s inside and out? How well you do on this quiz may depend on how many times you’ve disassembled this iconic rifle. If you can assemble an AR-15 in your sleep—or at least build your own—then this quiz should be a breeze. If you merely borrowed one at the range or admired this popular rifle from afar, then this quiz may stump you.

The questions start off easy, but you’ll need a keen knowledge of the rifle’s pins and springs to get a perfect score. Good luck!