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Thread: Can an A2 FSB with 4 set screws be mounted straight?

  1. #11
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    Quote Originally Posted by VaniB View Post
    Thank you too quib.

    Guys, all along I mistakenly thought that this 4 screw FSB was designed to be a quick and clean way to install a FSB without the more involved manner of drilling and using pins.

    I don't understand the concept of this 4 screw FSB being geared toward competiton shooting or "fine adjustments". Because if lateral windage movements on the target are necessary, wouldn't a shooter just revert to his back sight windage adjustments for all the right or left click that he needs?

    In other words, why mess with moving and readjusting the the FSB, when the rear sight is designed to do thatl?
    I don’t believe the intent of the set-screw FSB was to make adjustments during use.

    I believe the intent was to make any fine adjustments that may be necessary at the time of assembly / installation, so that larger rear sight windage adjustments during zeroing would not be necessary.

    ____________________________________________________________________________________________________________________________________


    ETA: A windage adjustable front sight base is standard on the White Oak Precision service rifle upper. The front sight base is forged and machined to our specifications. Opposing set screws are installed in the front of the base to allow for windage adjustment. A single set screw comes up through the bottom of the rear of the base to lock it in place and form a tight seal at the gas port. A 0.052" front sight post is standard, but we can make other sizes upon request. The top and sides of the post are tapered to provide a sharp sight picture. A set screw is installed under the sight post to lock it into place. We adjust the front sight base for windage to center the rear sight during test firing on all of our service rifle uppers.

    Source: http://www.whiteoakprecision.com/uppers-service.htm
    Last edited by Quib; 11-26-09 at 08:45.
    “A leader is best when people barely know he exists, when his work is done, his aim fulfilled, they will say: we did it ourselves.” -Lao Tzu


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  2. #12
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    Here is a pic I found of the flats.
    http://www.superiorbarrels.com/image...ge%20flats.jpg

    I would not cut them with a dremel but it's your barrel.

  3. #13
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    Quote Originally Posted by VaniB View Post
    scottryan... what you posted is exactly what I opened my thread asking folks not to post. It offers no technical opinion or first-hand experience to explain why you would not attempt it. For all I know, you've never tried it yourself, but your friend with a mallet in one hand and a Coors in the other told you "It don't go on no good". (??)


    We can't give you suggestions until you tell us what type of gun you are building. Are you building a competition gun where this might be necessary or building a fighting rifle? We are now 13 posts deep and this should have been posted in the OP.

    Why type of parts do you have? Is this some type of stainless competition barrel or a regular GI style barrel?

    Everything you have been told thus far is common general information.
    Last edited by scottryan; 11-26-09 at 11:37.
    "Not every thing on Earth requires an aftermarket upgrade." demigod/markm

  4. #14
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    Quote Originally Posted by Todd.K View Post
    Here is a pic I found of the flats.
    http://www.superiorbarrels.com/image...ge%20flats.jpg

    I would not cut them with a dremel but it's your barrel.
    QUIB.....
    That makes sense what you are saying that it is more for a secondary adjustment if it was needed.


    Todd...

    Thanks for that photo. No, you're right that the Dremel will certainly not provide the flats and a solid job like that!

    Until very recently, it was next to impossible during the last year to get anybody to answer their phone or emails about the work I wanted done. So the next best thing was for me to just buy the 18" Fulton barrel and the 4 screw FSB, which I now have sitting in front of me.

    I probably should not think as the DPMS 308 rifle as a serious SHTF battle rifle anyway, and should better rely on my Colt 6920 with its Eotech & BUIS, and its 68gr loads for that. So perhaps in that respect, I'll be OK as long as I'm not thinking of the possibility that I might actually some day be busting down doors with my 308 DPMS and slamming the FSB into hard surfaces.

    With the good info I have here thanks to you guys, I now have a clue how this works and what to expect. I'll dremel small marks into the barel to give the 4 set screws and blue-loctite as good a grip as possible. I don't think that these hidden dremel markings will cause any ruin to the Fultron barrel in the event that I ever need to have a REAL FSB installed. In the future, the marks made now would be hidden under a gas block or a new pinnedFSB. So I feel like I don't have anything to lose by installing this FSB, unless I'm overlooking something.

    Thanks again. I'm delighted with the knowledge of wealth and the time that you guys took to help me. At that other place, which supposedly has more subscribers, this question sat all week with practically no input at all except "Send it to ADCO" which is a lazy answer that teaches me nothing. I guess this place has more aficianados, and the other place has more kids. (??)

  5. #15
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    Center your rear sight. Go shoot. Make windage adjustments by moving the front sight post. When you get it lined up, torque it down and enjoy a frosty beverage.

  6. #16
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    I was going to buy one of those but instead bought a Armalite clamp on fsb.http://www.armalite.com/ItemForm.asp...1-edf0d7327c93 I didn't want to gouge my barrel up in case I wanted to later switch to a low profile gas block. It was easy to adjust windage by moving the fsb around.

  7. #17
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    Quote Originally Posted by Bbarsh View Post
    I was going to buy one of those but instead bought a Armalite clamp on fsb.http://www.armalite.com/ItemForm.asp...1-edf0d7327c93 I didn't want to gouge my barrel up in case I wanted to later switch to a low profile gas block. It was easy to adjust windage by moving the fsb around.

    1) You do realize that the FSB you have (if it's like the photo in the link) is a non-bayo lug variety. At first my supplier tried to pawn off one of those on me, and I sent it right back. Though I will never attach a bayonette to my FSB, a neutered and politically correct FSB is something that I will spot right away and just irks me. I can respect the fact that maybe it doesn't matter to you, or perhaps you live in a state that doesn't allow a bayo lug.

    2)I'm not real experieced in building AR weapons, but that I can tell, any marks or small drilling or even deep flats that are produced for your style FSB or my style FSB are going to be hidden underneath just about almost ANY style gas block or FSB you might choose to install in the future. Only a real FSB with taper pins will leave deep drill holes accross the barrel. But even those hole would be hidden under most gas blocks.

  8. #18
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    flats

    I did one, ground my own flats came out pretty good.
    Just make sure to "measure twice and cut once"

    Good luck

  9. #19
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    Bayonet lugs are HIGHLY over-rated. Speaking as someone who's done the bayonet assault course at Ft Knox (while enlisted), I can assure you, it'll be a LONG time before I choose to "affix bayonets" over any number of other commonly available weapons for home defense. I'd probably grab my kid's baseball bat first. An M9 is more useful when not stuck on the end of a rifle.

    So to address your real issue in this thread - take the damn thing to a machine shop and tell them you want flats milled into the barrel. Bring the FSB with you and expect to pay about 40 bucks.

    If none of them will help you out, PM me and package the works up with a check and I'll do the job and return it to you for that same 40 bucks.

  10. #20
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    Quote Originally Posted by VaniB View Post
    1) You do realize that the FSB you have (if it's like the photo in the link) is a non-bayo lug variety. At first my supplier tried to pawn off one of those on me, and I sent it right back. Though I will never attach a bayonette to my FSB, a neutered and politically correct FSB is something that I will spot right away and just irks me. I can respect the fact that maybe it doesn't matter to you, or perhaps you live in a state that doesn't allow a bayo lug.
    I need a bayo lug about as bad as I need a place to mount a grenade launcher. I'll never have either one so provisions to mount them are worthless for me.

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