I aquired an HK MR556 rifle and it came with non-diopter sights, I'd like to use authentic HK diopter sights and was wondering what precisely I should be purchasing. I've looked at several options on HKparts and am confused. I am using an Aimpoint M4S and have always preferred a lower 1/3 cowitness, and don't much care for folding sights. Thank you any advice.
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