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Thread: Zeroing my sights - what's normal and what isn't?

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    Zeroing my sights - what's normal and what isn't?

    So my BCM midlength just showed up. I mounted a Daniel Defense A-1 style sight on it and set out to zero it today. Although I think I've got it pretty close now, I feel like it took way too much adjustment to get it there. My first group at 50 yards was about six inches to the right. I had enough room in the sight to get what I think will be a close enough zero to fine tune at 100 yards but my rear sight is adjusted far to the left now. I'm a little concerned that I either won't be able to get it zeroed or that if I want to try different ammunition I won't have enough room to zero with it.

    So what's normal? What's in-spec and what isn't? Any insight would be appreciated.

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    Having to move the rear sight pretty far to the left is fairly common from my understanding. I know I had to do it for my Noveske set-up with Troy BUIS. It can be a sign of a canted FSB, but that usually isn't an issue with a quality manufacturer. My BCM is only slightly left.

    As long as you're not all the way to the left and still off, I don't see much of an issue.

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    I'm sure someone like Iraqgunz will know, but it seems like it is something close to ten clicks in either direction is considered acceptable? I should dig out my old TM and find this out, I know its in there somewhere.

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    How many clicks from center? Do you have the Daniel Defense A1.5 Fixed Rear Sight? I think 19 clicks each direction from center is all you have. So 6 or so inches should put you about 10-12 clicks used up.
    NRA Lifetime Member
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    The "in spec/out of spec" is based on A2 sights where the sights need to be adjustable to account for strong wind.
    If that isn't your application for the weapon, as long as it can be zeroed, it's fine.
    Generally, one is not going to be adjusting windage on A1 style sights under anything but range conditions.
    Jack Leuba
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    Quote Originally Posted by steelonsteel View Post
    I'm sure someone like Iraqgunz will know, but it seems like it is something close to ten clicks in either direction is considered acceptable? I should dig out my old TM and find this out, I know its in there somewhere.
    It's in the end pages of the applicable milspecs but this is a midlength so I guess you could slit the difference.

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    From my uneducated count, it seems that I've got about 14 clicks in each direction from this sight. Right now I'm about 8 left of center at 50 yards.
    With it being to the left, won't this mean that shots will continue to move laterally at longer distances?
    In other words, will my shots still be on for windage at longer distances?

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    Quote Originally Posted by goon View Post
    From my uneducated count, it seems that I've got about 14 clicks in each direction from this sight. Right now I'm about 8 left of center at 50 yards.
    With it being to the left, won't this mean that shots will continue to move laterally at longer distances?
    No.... If you're zeroed good at 50, you'll be fine at 100, 200, etc.
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by goon View Post
    So my BCM midlength just showed up. I mounted a Daniel Defense A-1 style sight on it and set out to zero it today. Although I think I've got it pretty close now, I feel like it took way too much adjustment to get it there. My first group at 50 yards was about six inches to the right. I had enough room in the sight to get what I think will be a close enough zero to fine tune at 100 yards but my rear sight is adjusted far to the left now. I'm a little concerned that I either won't be able to get it zeroed or that if I want to try different ammunition I won't have enough room to zero with it.

    So what's normal? What's in-spec and what isn't? Any insight would be appreciated.
    I got a BCM 14.5 Mid-length back in Oct, had the same "problem" with a MATECH rear sight. Also noticed that the Aimpoint had to be moved considerably left of zero. Seemed a little strange but it zero'd fine and shoots great out to 200 yds. Past 200 yds there is too much operator induced error to separate any sight problems.

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    Quote Originally Posted by goon View Post
    With it being to the left, won't this mean that shots will continue to move laterally at longer distances?
    In other words, will my shots still be on for windage at longer distances?
    Just as Mark said, no worries. Think about it like this. You're lining up the center-line of the sights with the center-line of the bore by moving the rear windage left and right. It's not as if the iron sights are on a different horizontal axis as the bore, and point of aim / point of impact will only cross at one lateral position. By moving the rear windage, you are eliminating that difference in axis. That's how the sights become zeroed.

    Now, if your zero is imperfect, as in the difference between POA and POI, then yes, that effect and error will be magnified at longer ranges.

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