For me, I was first taught using iron sights (notch ear and blade front). In 1978, I had my first experience with the M16A1. In boot camp, we had to qualify out to 500M. This was easily done by setting battle zero at 100M and using a proper sight picture for each given range (200M, 300M, and 500M). I first used the M16A2 in 1995 when I had to qualify in the Air Force Reserve. Not hard when we were only shooting from a very short distance on a target with multiple-sized targets on it. Never had to adjust for battle zero. I watched the video that was referenced. Personally, I agree with Larry. A1 sights are simple and you do not have to worry about bumping them and changing anything. Although I have some ARs with A2 sights, some with optics and BUISs, I still enjoy the simplicity of the ARs I have with A1 sights.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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