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1. They aren't flipped up, they're fixed back-up sights, you can't flip them up or down
2. It is perfectly fine to run both iron sights and an optic, it's called cowitnessing and some shooters prefer it as a way to acquire the reticle quicker. Examples:
https://www.thefirearmblog.com/blog/2024/04/24/tfb-review-daniel-defense-m4a1-fsb-upper/
https://www.recoilweb.com/daniel-defense-revamps-le-packages-12215.html