GUN AR crew... my BUIS is adjusted all the way and it's still shooting left

Discussion in 'On Topic' started by xpinchx, Mar 26, 2009.

  1. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    What should I do? :hs: It's a Midwest Industries sight on a Stag 2H.
     
  2. What kind of front sight?
     
  3. I see it's a standard FSB. First, I'd try making sure your BUIS is sitting flat and square. If it is, try another rear sight. If that one is maxed out on adjustment too I'd guess your FSB is canted. You'll have to contact the manufacturer and see how they want to handle it.
     
  4. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    What's the best way to check if it's flat/square?

    At a glance the FSB appears to be in line with the rest of the rifle, and even if there is a slight cant it wouldn't be enough to throw the rear sight adjustment all the way to one side... I know what to look for too since my WASR had a slightly canted FSB that I had to re-pin. :hs:
     
  5. Just look at the BUIS. If it looks good, it probably is. Another thing that can cause windage issues is an improperly torqued barrel. You can fix that yourself if you have the tool to tighten the barrel nut. Other than barrel torque issues and sight canting, there's not much else to cause your problem.
     
  6. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    If I look over the top of the rifle when it's straight I can see the ears of the sight don't quite line up with the lines on the top of the handguard... I tried moving it to different places on the rail and it's the same... So it must be something with the rear sight... :dunno:
     
  7. Do you have another rear sight that you can try?
     
  8. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    :rofl: No, this is my first AR so I don't have any spare parts laying around.
     
  9. Keesh

    Keesh New Member

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    Just throwing this out there, probably not the case, but when you move the rear sight left, your POI will move left.

    How far left is it shooting?
     
  10. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    Right now it's not too bad, it's about 2-3" left at 25 yards with it adjusted all the way to the right.

    Here's a pic to help show what's going on... blue is the center line of the rifle, red is where the "ears" of the sight line up at.

    [​IMG]
     
  11. dpixel8

    dpixel8 New Member

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    and that's not lined up? one of mine is like that (Model 1 Sales upper half) and it works fine, adjusted almost all the way to the right
     
  12. dpixel8

    dpixel8 New Member

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    nvm, barrel is probably off
     
  13. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    Still shooting several inches left and it's all the way to the right so I cant switch between apertures. At 50 or 100 yards that's pretty far off...

    BTW the barrel is perfectly in line behind the FSB in that picture, or at least really close to it. The point of the picture is to show that the rear BUIS isn't even close to being in line with the rest of the rifle.
     
  14. dpixel8

    dpixel8 New Member

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    fuck yeah it is. go with what market garden said. see if you can adjust it if you have the tools, otherwise send it back
     
  15. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    Is it for sure a problem with the BUIS? I've been waiting like 18 weeks for this upper I would hate to have to send it back and wait even longer... Even though it's a MI sight it shipped with the Stag kit... that I bought from another supplier... Should I be contacting the seller, Stag, or MI?
     
  16. dpixel8

    dpixel8 New Member

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    oh your front sight is a BUI, not a fixed A2 sight?
     
  17. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    It's a standard F-marked FSB. It looks completely in line to me. I thought we narrowed the problem down to the (rear) BUIS?
     
  18. dpixel8

    dpixel8 New Member

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    yeah i dunno then :hs:
     
  19. So the whole BUIS assembly is off center?
     
  20. Skot281??

    Skot281?? New Member

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    Check torque on the barrel nut.
     
  21. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    I think so but I might be wrong after reading about the barrel torque thing. Maybe I should just contact stag?... fucking sucks though I wish shit just worked the way it's supposed to when you buy it.
     
  22. Yeah, let Stag tell you what to do. If it's gotta go back to them they should be fast with it at least.
     
  23. cabriolet

    cabriolet ...

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    holy fucking train wreck of a thread, does anyone know what the hell is going on in here?

    Take it to a gun smith.
     
  24. We know what's going on. One of 3 things. Canted FSB/ bad rear sight/ incorrect barrel torque.
     
  25. cabriolet

    cabriolet ...

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    There was way too many neverminds, oh so you'res, so thens, etc. lol
     

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