I got interested in this a few days ago when I was wondering what the best method of zeroing a standard 16" OAL 556, I had always been told to zero optics and sights to 100 yards. I asked some guys at my LGS and one guy said 25-300 meter and another guy said 36-300 yard. I then learned that the Army teaches meters and the Marines teach yards. Then they went into talking about astrophysics, ballistics, quantum mechanics and started talking about BZO and how zeroing at 25 meter, 36 yard, and 50 yard is only to get you on paper and close to where you should be shooting at 300 meters, 300 yards, and 200 yards. I didn't understand a word of it yet I nodded and told them it made perfect sense and thanked them.
For a civilian with a 16" OAL 556, what is the best approach to zeroing BUIS, red dot & Peq-15? All the same or slightly different?
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