I'm assuming you are speaking of an AR-15 since you said 5.56 semi-auto.
You get what you pay for so spend $149 on a red dot and you get junk.
The point is that red dots are made to put on assault rifles aka AR-15. In the context of assault rifles, they are used in close quarters at ranges of 50 yards or less in most cases.
Red dots imho are great for AR's. No parallax, night vision equipped, can flip up a rear sight and see the front sight through the red dot.
Vortex makes a good quality red dot in the $250 range. Sight it in, put the red dot on something at 50 yards and your dead on, put it on something at 100 yards and hit your target within 2 moa.
You can put a long range scope on a 5.56 semi-auto if you want. It's all about what you are doing with the gun.
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