I measured my MBUS front post and it was 0.100", if I was going to use the irons more I'd certainly like a 0.050 NM or something similar.
I have no idea if the 15-22 uses the standard A2 post or how to swap it, that said, the post is only a few dollars. Tossed in with a larger order it would be worth it to have and try to unscrew the post in the sight and replace it with the one you're bought.
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