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Thread: Help determining if my FSB is canted?, Newbie post.

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    Help determining if my FSB is canted?, Newbie post.

    Hey guys, a FNG here. I already posted this on another AR forum because it took over a week just to be able to post on here. I got a few responses, figured I'd pick everyone's brain that I could.

    I recently finished my first AR build this month. I've been selling guns at a major retail sporting goods chain for 6 years now and finally decided to buy my own instead of looking at them all day.
    I sighted the weapon in this past weekend and ran into a little issue. My rear BUIS windage had to be clicked over to the left 13 clicks from center. Is this too much?

    When I bought my upper, It was setup for clam-shell style hand guards and since I bought free floating guards I had to have a gunsmith put the hand guards on. It required the removal of the flash hider, FSB, barrel nut etc. and I didn't have the tools to do it on my own.

    When I originally got the gun back, I noticed the front A2 post looked canted. When shouldering, it was visibly tilted to the left. The gunsmith must has rushed it or whatever (he did it very quickly with me still in the store).
    So, I took the gun back and he adjusted it. This time it seems *pretty* dang straight up and down when you follow the picatinny down to the FSB. I say pretty dang straight because It still could be ever so slightly to the left.

    When I sighted the gun in, all 4 people I was with including myself were shooting way to the right. I wound up clicking the windage over about 13 clicks from center to 0 it in @60 yards.

    Does anyone have any advice on what my issue could be? Should I take the gun back to the gunsmith a third time? I emailed him and he wants me to bring it back.

    -BCM: upper receiver w/ 16" M.P./H.P. hammer forged barrel, lower receiver, bolt carrier group, "Gunfighter" Mod. 4 charging handle
    -Daniel Defense 9.0" Lite free floating hand guard
    -Troy Ind. Rear BUIS
    -Magpul: CTR stock, MOE+ grip w/battery box, B.A.D. lever, A.S.A.P. rear sling attachment & P-Mags.


    I've included some pictures for reference for you guys.

    Thanks!
    Steve







  2. #2
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    Welcome to M4C.

    I want to make sure that I am tracking here. Did this barrel already have an FSB in place, and it was simply removed in order to install the rail? If so, then I am not seeing how it can be off unless he really beat the pins in. Generally when doing an FSB removal I make sure to put the pins back in the same hole that they were removed from.

    13 clicks isn't excessive and I wouldn't be concerned.

    Why were trying to zero at 60 yards? I recommend that you do either a 50 yard or 100 yard zero.



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    Quote Originally Posted by Iraqgunz View Post
    Welcome to M4C.

    I want to make sure that I am tracking here. Did this barrel already have an FSB in place, and it was simply removed in order to install the rail? If so, then I am not seeing how it can be off unless he really beat the pins in. Generally when doing an FSB removal I make sure to put the pins back in the same hole that they were removed from.

    13 clicks isn't excessive and I wouldn't be concerned.

    Why were trying to zero at 60 yards? I recommend that you do either a 50 yard or 100 yard zero.
    The upper had the FSB mounted from the factory. I wanted the upper they offered with then DD guards already on, but I waited 8 months for it on backorder and then said screw it. BCM is great with emailing you back, but are terrible with giving a dang close eta on products out of stock.

    I sighted at 60 because I am only a recreational shooter, and my range setup at my hunting cabin is approx 60 yards from the porch.

  4. #4
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    Since that is the factory FSB, and you only moved it 13 clicks and based on your photo then I wouldn't be concerned.

    I would still sight the weapon in correctly. You can zero at 50 which will probably more than adequate for your needs.

    Quote Originally Posted by Steve069 View Post
    The upper had the FSB mounted from the factory. I wanted the upper they offered with then DD guards already on, but I waited 8 months for it on backorder and then said screw it. BCM is great with emailing you back, but are terrible with giving a dang close eta on products out of stock.

    I sighted at 60 because I am only a recreational shooter, and my range setup at my hunting cabin is approx 60 yards from the porch.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

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    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

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    Quote Originally Posted by Iraqgunz View Post
    Since that is the factory FSB, and you only moved it 13 clicks and based on your photo then I wouldn't be concerned.

    I would still sight the weapon in correctly. You can zero at 50 which will probably more than adequate for your needs.
    But if it was canted dramatically when he put the guard on initally, that means it could still be somewhat canted, right?

    The DD handguard has a proprietary barrel nut and as the gaurd is tightened in place, it can twist it ever so slightly. I know this for a fact because when I got the gun back for the first time it was very, very visibly offset to the left. I'm getting the same response from the other forum saying to just leave it alone and deal with it, but if it was very canted initially, how do I know its not still barely canted?

    At extremely close inspection, one side of the hand guard has just a bit more mass to the one side of the FSB. It's very, very miniscule but it's there...like a push button lead pencil width. Small, but visible. I'm not sure how else to describe it.

    Steve

  6. #6
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    If it was canted dramatically then it would have had to have been a factory issue. Unfortunately, since someone has already wrenched on it then DD may not address the issue.

    I have removed plenty of FSB's and installed plenty of rails to include DD and never had an issue. I have never seen a properly installed DD rail "twist". What I would do is get a proper zero on the weapon and then shoot it at longer distance which is really when you will find out where you are at. Short of that you are just beating the bush.

    Quote Originally Posted by Steve069 View Post
    But if it was canted dramatically when he put the guard on initally, that means it could still be somewhat canted, right?

    The DD handguard has a proprietary barrel nut and as the gaurd is tightened in place, it can twist it ever so slightly. I know this for a fact because when I got the gun back for the first time it was very, very visibly offset to the left. I'm getting the same response from the other forum saying to just leave it alone and deal with it, but if it was very canted initially, how do I know its not still barely canted?

    At extremely close inspection, one side of the hand guard has just a bit more mass to the one side of the FSB. It's very, very miniscule but it's there...like a push button lead pencil width. Small, but visible. I'm not sure how else to describe it.

    Steve



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  7. #7
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    That flip up, grabasstic excuse for a sight is more likely to be out of whack. Is that one of those Troy creations? They're ALWAYS popping up on the forums with lots of windage required.

    And I agree... the windage is acceptable.. even with the poo sight.
    "You people have too much time on your hands." - scottryan

  8. #8
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    Did you check that the FSB was perfectly straight before you had the work done on it? I have in the past received a factory BCM upper with a slightly canted FSB. It's unlikely the smith made an error reinstalling the FSB.

    Another possibility is that the barrel nut may be over torqued. Did the smith remove the barrel at any point?

    13 clicks is within spec. But if it really bothers you, an alternative is going with a low pro gas block and floating a midlength rail over it.

  9. #9
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    If the smith wants it back take it back. I prefer as close to zero wind in live fire as possible on my rifles for several reasons. As long as you know where you're hitting at other ranges (if you intend to shoot at other ranges) don't worry about your zero range.

  10. #10
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    I know what is wrong with your FSB, you are drinking STROH's!


    Sorry, couldn't hellp myself. Off to the corner I go.





    C4
    Last edited by C4IGrant; 11-29-11 at 09:34.

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