I bought these to replace the half-moon sights that came on my M9. I love the three dot system, but the only complain I have is that when firing rapidly, you can lose the front sight in the mix with all of them looking the same. That problem is solved by having red rear sights with a white front sight. There was also a very small increase in the distance from the front to rear sights with this upgrade which, while this is another upside to these sights, I don't think it is significant enough to consider for combat accuracy. This upgrade is one of the best I have made to my M9 along with upgrading the hammer spring.
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