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Thread: Flat top uppers optics and FSB

  1. #1
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    Flat top uppers optics and FSB

    I intend on mounting a 3-9x38 scope on a flat top upper. If I order a standard BCM upper with the FSB will the front sight obstruct the scope requiring me to mount the scope higher than ergonimically optimal ( I want to be able to maintain a cheekweld.)

    It will basically be a scope only gun, unfortunately I missed out on the S&W OR deal and can't find another quality rifle without a FSB, and don't know if it is even an issue.

  2. #2
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    I don't think you will notice it at 3x.

  3. #3
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    It could be as little as 1.5x, and an FSB wil not scientifically/technically interfere with the shooter's ability to observe or shoot. The FSB is optically burned through because it's inside the near-focus range of the magnified optic. One will likely note a blur at the bottom of the field of view, but it can be seen through.

    It may psychologically interfere if the shooter vapor-locks on the indistinct blur at the 6 o'clock position instead of what's downrange, but that's not the same thing, human error only.
    Contractor scum, PM Infantry Weapons

  4. #4
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    No. The focal length will make the FSB disappear, other than a faint shadow. You won't pick-up any detail, so the shadow shouldn't be a distraction.

  5. #5
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    In your other post you said you had already bought the S&W, something is fishy here....your other post was odd, but now this one. hmmm...After about 2x i really don't notice the FSP, FWIW.

  6. #6
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    This is something I never knew.

    You mean I can mount a scope and not worry about the FSB blocking the sight picture using 1" Picatinny-Rings?



    http://www.midwayusa.com/viewproduct...tnumber=116860
    "You won't rise to the ocassion, you'll default to your level of training." Barrett Tillman

    NRA LE Handgun/Shotgun Instructor
    Pa ACT235 Firearms Instructor
    Certified Glock Armorer

  7. #7
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    You still want the scope mounted around 1.5" above the rail. The highest rings Ive used on an AR were 1.375", and those had a tight cheek weld. 1.0" rings would be exceptionally low, and you would struggle to get a good sight picture without smashing your cheek against the stock.


    But even with a 1.1X scope the FSB just becomes a faint shadow.

  8. #8
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    "You won't rise to the ocassion, you'll default to your level of training." Barrett Tillman

    NRA LE Handgun/Shotgun Instructor
    Pa ACT235 Firearms Instructor
    Certified Glock Armorer

  9. #9
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    This may be just what I want.

    http://www.midwayusa.com/viewproduct...tnumber=199560



    And it's on sale for $69.99
    "You won't rise to the ocassion, you'll default to your level of training." Barrett Tillman

    NRA LE Handgun/Shotgun Instructor
    Pa ACT235 Firearms Instructor
    Certified Glock Armorer

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