Pennsylvania Firearm Owners Association
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  1. #1
    Join Date
    Jul 2007
    Location
    Boalsburg, Pennsylvania
    (Centre County)
    Posts
    4,510
    Rep Power
    3044261

    Default FSB for Flattop AR?

    So I recently converted my A1 carryhandle carbine to A3 Flattop.
    While I was able to sight the weapon with BUIS, I had to crank up the front sight post ALOT to get it to sight in.
    Then I remenbered reading somewhere that they have 2 different FSB hight - called F-marked FSB.

    Can someone explain it to me, and where can I get one.
    Also, will replace FSB with gasblock/folding front sight would correct the issue as well?
    Audemus jura nostra defendere

  2. #2
    Join Date
    Feb 2008
    Location
    Monroeville, Pennsylvania
    (Allegheny County)
    Posts
    6,650
    Rep Power
    21474859

    Default Re: FSB for Flattop AR?

    Quote Originally Posted by Mity2 View Post
    So I recently converted my A1 carryhandle carbine to A3 Flattop.
    While I was able to sight the weapon with BUIS, I had to crank up the front sight post ALOT to get it to sight in.
    Then I remenbered reading somewhere that they have 2 different FSB hight - called F-marked FSB.

    Can someone explain it to me, and where can I get one.
    Also, will replace FSB with gasblock/folding front sight would correct the issue as well?

    Bushmaster sells a .040 taller front site post for non F marked front site bases with A3 uppers, alot easier than changing out the front sight tower.

  3. #3
    Join Date
    Mar 2006
    Location
    NE Philadelphia, Pennsylvania
    (Philadelphia County)
    Posts
    221
    Rep Power
    336455

    Default Re: FSB for Flattop AR?

    +1 on the Bushy taller front sight.

    It looks funny in the sight picture, as the top of the sight when flush is about the same height as the FSB ears.
    AR accessories - Barbie for men

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