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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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