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ACOG mount, changing to Larue 681..

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Changing scope mount to bring the ACOG a little further back, and was wondering, do i have to re-zero the rifle.
Right now the ACOG is butted up against the rear sites on the 516, and with the Larue it will come back an inch to 1 1/2inch? Not sure yet.
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If it's already butted up against the BUIS how can it move any further back?
Do you mean it's going to move forward onto rail toward muzzle end an inch to an inch and a half? Either way that little of a movement with same optic on same gun most likely will have zero effect on POI. But hey it sounds like a good reason to go shoot it and see. :)
 

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Discussion Starter · #3 ·
Sorry, I am going to take rear sight off.
I wasnt thinking straight, only half a cup of coffee.
It will clear charging handle.
I will measure it before and after install tomorrow.
 
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