Pennsylvania Firearm Owners Association
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  1. #1
    Join Date
    Dec 2009
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    (Westmoreland County)
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    Default AR-15 front rail to low?

    Today I got my magpul front and rear back up sights.

    Also before getting the front and rear back up sights I noticed that the front rail looked a little bit lower, maybe by 1cm.

    Anyways did anyone else have this problem before?

    Images:
    http://i48.photobucket.com/albums/f2...b/102_3327.jpg
    http://i48.photobucket.com/albums/f2...b/102_3319.jpg

    Without sights:
    http://i48.photobucket.com/albums/f2...b/102_3317.jpg


    At first i thought maybe i had to reverse them. but in the manual it showed them the way they are in the picture. also when i reversed the sights the part the flips up hangs off the rail. so then i decided to look up some pictures online of how other people have the magpul backup sights on, and they have them on how i have them on in the picture. so is it the ar 15 front rail that is to low?

    Thanks.

  2. #2
    Join Date
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    Bellwood (Tyrone), Pennsylvania
    (Blair County)
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    Default Re: AR-15 front rail to low?

    Rail is OK, handguard is too high!!!

  3. #3
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    Apr 2009
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    Jamison, Pennsylvania
    (Bucks County)
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    Default Re: AR-15 front rail to low?

    The Magpul MBUS sights were not designed to be mounted on the gas block. The gas block is not on the same plane as the upper receiver rail.

    The rear sight is fine, but the front sight is made to mounted on a forend rail.
    Last edited by kindred_spirits; December 15th, 2009 at 10:52 PM.

  4. #4
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    Aug 2009
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    Wilkes Barre, Pennsylvania
    (Luzerne County)
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    Default Re: AR-15 front rail to low?

    It does appear the gas block is lower than the receiver rail. Take a yard stick and lay it flat on top of the receiver rail, it should also lay flat on top of the gas block rail for the buis to line up correctly. Use the edge of the yard stick for rigidity.

    More important, I'm not sure the Magpul BUIS being plastic and all, will hold up well on the gas block like that.

    Did you get your AR like that? Maybe call the manufacturer and ask what kind of sight to install on the gas block.

  5. #5
    Join Date
    Mar 2008
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    Pittsburgh, Pennsylvania
    (Allegheny County)
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    Default Re: AR-15 front rail to low?

    Quote Originally Posted by Watchman View Post
    More important, I'm not sure the Magpul BUIS being plastic and all, will hold up well on the gas block like that.
    Yep ... plastic on the GB is not a good thing. Your GB will get hot.
    Quote Originally Posted by GunLawyer001 View Post
    If the police could confiscate all of your guns and ammo using just one van, then you didn't own enough guns or ammo.
    WTB - NDS3 or NDS1 receiver FTF

  6. #6
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    Latrobe, Pennsylvania
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    Default Re: AR-15 front rail to low?

    I got it figured out. I didnt think I needed a gas block sight. I figured the front sight i got would just fit on it. I contacted the manufacture and got a recommened sight and an idea on others.

    Thanks for the help.

  7. #7
    Join Date
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    noneville, Massachusetts
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    Default Re: AR-15 front rail to low?

    Quote Originally Posted by Watchman View Post
    It does appear the gas block is lower than the receiver rail. Take a yard stick and lay it flat on top of the receiver rail, it should also lay flat on top of the gas block rail for the buis to line up correctly. Use the edge of the yard stick for rigidity.

    More important, I'm not sure the Magpul BUIS being plastic and all, will hold up well on the gas block like that.

    Did you get your AR like that? Maybe call the manufacturer and ask what kind of sight to install on the gas block.
    Quote Originally Posted by mojo View Post
    Yep ... plastic on the GB is not a good thing. Your GB will get hot.
    To clarify - their products are not your run of the mill plastics. Personally I think it would hold up on a semi automatic AR that's not being pushed to hard (bumpfiring mag after mag).

    Their "special polymer blend" is really durable. I'd melt a PMAG in the oven to test when they start to warp but I can't bring myself to it.

  8. #8
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    New Castle, Pennsylvania
    (Lawrence County)
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    Default Re: AR-15 front rail to low?

    why would you even suggest something like that! you will NEVER EVER EVER see that kind of torture, unless your mags are out of your fireproof safe, and your house catches fire! oh yeah, I got an iron front site for mine....
    "Do not use K-9 advantix on cats"

  9. #9
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    Default Re: AR-15 front rail to low?

    Quote Originally Posted by Bmarshall91 View Post
    why would you even suggest something like that! you will NEVER EVER EVER see that kind of torture, unless your mags are out of your fireproof safe, and your house catches fire! oh yeah, I got an iron front site for mine....

    Is your iron front sight on the gas block? if so, what did you get? Im still trying to decide on a few.

  10. #10
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    Default Re: AR-15 front rail to low?

    Quote Originally Posted by Elkerb View Post
    Is your iron front sight on the gas block? if so, what did you get? Im still trying to decide on a few.
    I like standard FSB with BUIS in the rear, and a RDS between.

    ala:


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