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Thread: Trouble with Mk18 zero

  1. #11
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    Quote Originally Posted by Iraqgunz View Post
    For the record I have fired about 2K rounds of that ammo with no issues at all. You could simply have a bad barrel. Maybe the gunsmith jacked up the crown when he was changing the muzzle device?
    IG, I don't really think its ammo related. I'm my other gun I've put 10 rounds in a little over the size of a quarter with 1-4 vortex scope. I'm going to re check the rail, re center the irons, borrow a rest and see if I can shake this thing down. My time is limited as I spend most of my time working in the hospital so any other ideas or things I could check before the next time is shoot next week would be appreciated.

  2. #12
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    Quote Originally Posted by t15 View Post
    Try running the stock in the longest position and your eye farther from the aperture.

    I always zero with an aimpoint and then adjust the irons to the dot (stock all the way open and away from the aperture)
    I couldn't disagree more. Precision shooters get the rear app as close to the eye as possible, and the front sight far forward.

    I always zero irons first... then match the dot to the irons and shoot a confirmation group with the dot alone.
    "You people have too much time on your hands." - scottryan

  3. #13
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    Quote Originally Posted by markm View Post
    I couldn't disagree more. Precision shooters get the rear app as close to the eye as possible, and the front sight far forward.

    I always zero irons first... then match the dot to the irons and shoot a confirmation group with the dot alone.
    Yep, I don't think it is wise to not zero independently.

  4. #14
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    I guess zeroing one or the other first is up to the shooter... but backing off of the rear app doesn't make sense to me at all.

    And there should definitely be a POI shift with the rear sight adjustment.
    "You people have too much time on your hands." - scottryan

  5. #15
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    When I back off from the rear sight, it makes the hole smaller and easier to center the front post. obviously always confirm zeros on the bench independently and run the longest sight radius you can.

    maybe im just crazy

  6. #16
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    Quote Originally Posted by t15 View Post
    When I back off from the rear sight, it makes the hole smaller and easier to center the front post. obviously always confirm zeros on the bench independently and run the longest sight radius you can.

    maybe im just crazy
    I know what you're saying... but when you move your eye closer to the rear app, you decrease the margin of error. The eye tends to naturally center in the app, and you focus completely on the front sight post.
    "You people have too much time on your hands." - scottryan

  7. #17
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    when you say margin of error, you mean a small misalignment further from the aperture will have a bigger effect on POI? thanks!

  8. #18
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    Quote Originally Posted by t15 View Post
    when you say margin of error, you mean a small misalignment further from the aperture will have a bigger effect on POI? thanks!
    Kind of. You can more precisely center a sight post in a relatively big circle than a smaller one. When I first got an AR way back in the 90s, I too wanted to back off the rear app. But in reality getting as close as possible increases precision.
    "You people have too much time on your hands." - scottryan

  9. #19
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    thanks for the tip

  10. #20
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    As an update, got a bore sight and lined irons and I point up at roughly 20-25 yards. Do most zero SBR's at 50 or 100? Longer guns have a 100 yard zero but I'm debating what's best for this one.

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