You are overthinking things in my opinion. Lots of AR shooting is done inside of 75' and there is nothing wrong with that. Your iron sights are not ultra precise instruments and you can get plenty of good practice familiarizing yourself with your new gun including not just sight-in, but handling and function as well.
The closer the range, the tighter you should expect your groups to be, so it is possible to challenge yourself at almost any distance. Go shoot the thing!
We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution.
Abraham Lincoln
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