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I feel like a dummy for having to ask this, and the owners handbook doesn't shed any light and my googling is fruitless. My first AR-15 that I bought in circa 2008 is a Olympic Sporter. It's a 16" carbine with an A1 style upper, 1:9 barrel. It has two aperture rear sights, one is blank the other is labeled "A-1". I don't shoot it much any more but I'm getting interested in doing things right so I want to know more about how I'm supposed to use the sights.
My question is this: Is there a blanket answer for what the difference is between the blank sight and the "A-1"? I'm pretty sure "A-1" is for longer range, but how much longer? Am I supposed to zero the blank sight at X yards and that means when I flip to "A-1" that means it's zeroed at X+Y yards?
My question is this: Is there a blanket answer for what the difference is between the blank sight and the "A-1"? I'm pretty sure "A-1" is for longer range, but how much longer? Am I supposed to zero the blank sight at X yards and that means when I flip to "A-1" that means it's zeroed at X+Y yards?