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Anyone else require excessive left windage with Magpul flip-up rear sight?

Discussion in 'Black Rifle Forum' started by cowboy1964, Oct 10, 2012.

  1. cowboy1964


    Sep 4, 2009
    Ok, I've now tried two different uppers (M&P carbine and PSA mid-length) and both require the rear Magpul sight to be moved over more than half way to the left. Originally I figured my M&P FSB was canted but now I'm not sure so sure. I don't have another rear sight to try.

    Not a huge deal and I zeroed my new PSA upper just fine but I am a bit OCD.
  2. Cole125

    Cole125 Silver Member

    Apr 5, 2008
    Far West, USA
    Its probable the front sight base is slightly canted. Typical PSA bs.

  3. WoodenPlank

    WoodenPlank Who?

    May 15, 2010
    NW Florida
    He's having the same issue on two different uppers.

    OP, sounds like the mating surface on the sight itself might be out of spec(assuming this is the same sight on both guns). Try a different rear sight of some kind and see if the problem carries over. I'm sure a local gun shop or range will have one you can try for a few minutes.

    If it is the sight, I have no doubt that Magpul will make it right.
    Last edited: Oct 10, 2012
  4. mvician

    mvician Lifetime Member

    Jun 8, 2007
    NW Indiana

    Then that would also include typical S&W bs then, wouldn't it?


    OP, it happens, tolerance stacking between the FSB, the upper receiver, and the BUIS.

    example of one of mine, It's not bad, probably looks worse with a MBUS since they are relatively "thick", so I think it makes it look worse than it really is.


    Last edited: Oct 10, 2012
  5. superspud

    superspud Ninja

    Jul 10, 2006
    The Lone Star State
    Experiencing the same thing with mine. Doesn't bother me too much, it's sighted in and I'll probably never adjust it again so no worries.
  6. captdreifus

    captdreifus aSun666

    Jul 24, 2008
    Tempe, Arizona
    I have a Troy battle sight that needed 27 clicks to the left on a BCM mid length. It happens.
  7. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    Nov 24, 2005
  8. MrMurphy

    MrMurphy ********* Moderator Moderator Millennium Member Lifetime Member

    Jan 16, 2001
    Buried in the X-files
    Seen a guy with a factory new M16A2 require nearly a complete all the way right adjustment to zero.

    Wasn't the gun, it was him. Because we mechanically zeroed the gun and I was 3 clicks left, another guy was about four clicks right.

    Strange things happen.

    Call MagPul.
  9. arushus

    arushus Biggest Member

    Jul 22, 2011
    NE Oklahoma
    My magpul buis requires quite a bit of left windage also...I always just attributed it to tolerance stacking and that it was just how my gun was.
  10. jeepinbandit

    jeepinbandit Sgt. USMC

    Dec 27, 2007
    NAS Fort Worth JRB
    Mine is about the same between multiple rifles using the MBUS or carry handle. It might just be the way you zero your rifle to you.
  11. michael_b

    michael_b BRC #1492

    Sep 3, 2011
    My PSA upper with Magpul BUS is set at dead center. Guess just depends on the rifle as I've read many stories about having to adjust the sight far to the left to get it sighted in.


    HAIL CAESAR Senior Member

    Mar 1, 2007
    In my shop
    It is not an issue. Just sight it in and shoot it.