That depends on if you're keeping the irons, your cheek-weld, etc.
On my 15-22 I don't need irons, so I put my Bushnell closer to the charging handle.
On my 5.56, I moved the Aimpoint forward to clear the BUIS. With a 1x red dot, it doesn't make a lot of difference where you put it on your rail. Find a spot where it's comfortable for you and set it there.
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