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Both is good. I have MBUS or other flip-up "iron" sights on anything that has holo/red dot sights unless it's strictly a range toy. Sig seems to have the best inexpensive red dots. If budget is an issue I would start with the MBUS since they seem like they would be less prone to failure or defects. I've never had MBUS fail and I've had cheap optics pack it in more than once.OK fine you have convinced me. I picked up an assembled 16" upper with an M-Lok handguard on sale, and a $139 PSA complete lower. Now I am trying to decide between MBUS sights or a cheap red dot or both.