Any back up iron sights (BUIS) (or plastic sights) will work. The MOE version of the 15-22 comes outfitted with the Magpul sights, the same you can buy separately. There is nothing special about them.
While there can be nothing more infuriating than a red dot losing power, I don't even use my BUIS.. It's easier to keep a spare battery, and ensure that the reticle works BEFORE going to the range. I do it every time.
However, I do have a set of Black and FDE Magpul BUIS.. I guess I could part with a pair for about $55...
Or, you could ebay and get an inexpensive chinese knock-offs for about $10.
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