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Thread: Midlength barrel with non-F-marked FSB

  1. #31
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    Quote Originally Posted by sr71plane View Post
    I just thought that I would ask the experts around here, but I get a typical smart a-- answer.
    I was going to ask the same question. I briefly had a 6720 upper that shot way high and I refuse to have a sight post tall enough to get that thing to zero. I should have researched that model more before I bought it, but I made an assumption and got bit...

    You know the drill. If Colt ****s up, you obviously need more training. Or you should use the orange search button. And this is not Facebook. Contact the manufacturer.

  2. #32
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    An update: Heard back from the manufacturer. They said that despite the fsb not being marked, it would be gtg. Finally got it assembled and took it to the range yesterday. Got a good zero @ 50 yd with M855. Thumbs up.

    Happy Easter.
    Last edited by gt5966b; 03-31-13 at 13:19.

  3. #33
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    Quote Originally Posted by gt5966b View Post
    An update: Heard back from the manufacturer. They said that despite the fsb not being marked, it would be gtg. Finally got it assembled and took it to the range yesterday. Got a good zero @ 50 yd with M855. Thumbs up.

    Happy Easter.
    good to hear it all worked out for you, the rifle I just put together for my buddy has an LMT upper with a non F marked FBS. H put a rear troy flip down sight on it then I went and sighted it in on Friday while he had to work. Everything was good to go.
    "If you love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that you were our countrymen"

    -Samuel Adams, 1776

  4. #34
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    Did you have to unscrew the front post much to achieve that, gt5966b? Or is the post still close to mechanical zero (indicating the FSB is proper height)?

    Anyway I think it's important to quote what Iraqgunz said a while back because it's so true. As he pointed out Remington (then later he pointed out Bushmaster) use the wrong height FSB on their A4 receivers expecting no one will complain. Usually few do so they get away with it. So don't take the manufacturer's GTG claim unless it really is GTG.

    This practice goes beyond Remington and Bushamster - DPMS, ArmaLite and RRA do it as well. I had an ArmaLite upper that I had to back out the front sight where it wobbled to get it to zero. I then got a 0.04" taller front sight post which solved that issue but as IG said the post stuck out above the protective wings and was a worry to me. I finally traded off the upper and got a Daniel Defense (that guess what - had an F-marked FSB in the first place).


    Quote Originally Posted by Iraqgunz View Post
    Yes, I understand that. But, this is why trash peddlers have been able to survive. Because people to know that they didn't know and then once they did they didn't force the issue. Had that been happening companies would have figured out it was cheaper to do it correct the first time or they would have been impacted financially or their name would have been shit.

    I was contacted by a police agency in Australia that purchased Remington R4 carbines and they are having issues because they are using Magpul rear sights and Aimpoint Comp M2's and they can't get a proper zero with their non F-marked FSB's.

    Now they have to get taller posts, but they are concerned about officers damaging them because the posts will stick up out of the protective wings.

    In the OP's case he has purchased a barrel only. So I would contact that company and tell them to make it right.
    US Army 1966-69, VFW Life Member, Retired Geek

  5. #35
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    Quote Originally Posted by Quentin View Post
    Did you have to unscrew the front post much to achieve that, gt5966b? Or is the post still close to mechanical zero (indicating the FSB is proper height)?
    doesn't seem too bad, but i'm not an expert. I would be interested to hear others' opinions.


  6. #36
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    That is not a F-marked hight front sight and would get the taller post to lower the bottom of the flat surface for better support of the sight post.

  7. #37
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    Quote Originally Posted by michael word View Post
    That is not a F-marked hight front sight and would get the taller post to lower the bottom of the flat surface for better support of the sight post.
    well that sux.

  8. #38
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    Yeah that's definitely an A2 height FSB which would be fine if the barrel had been installed in an A2 upper, not a flat top. I had to unscrew my ArmaLite post even further to zero at 100 yards and it flopped around. I'm fairly sure you would too if zeroing at 100 yards. You might want to try that to have more points to make if you take on the manufacturer.

    If the manufacturer advertised an F-marked FSB then what showed up at your door should have been right. That definitely is not GTG except on an A2 upper. If nothing else they should knock something off the price to help you out.
    US Army 1966-69, VFW Life Member, Retired Geek

  9. #39
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    Quote Originally Posted by Quentin View Post
    Did you have to unscrew the front post much to achieve that, gt5966b? Or is the post still close to mechanical zero (indicating the FSB is proper height)?

    Anyway I think it's important to quote what Iraqgunz said a while back because it's so true. As he pointed out Remington (then later he pointed out Bushmaster) use the wrong height FSB on their A4 receivers expecting no one will complain.
    I agree completely the correct way is to have a F marked FSB or at the very least come with the taller front sight post.

    However, perhaps they use the "wrong" FSB because they actually DO have very few that complain? We have 12 bushmaster carbines at work and everyone of them are sighted in at 50/200 zero. None have the taller front sight post and none of them (while they do stick out some) extend past the ears or "wobble" around.

  10. #40
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    In this case, I'd get the taller Front sight post and be done with it. I like my front sight to be as close to mechanical zero as possible.... It'd drive me nuts sticking out that far from the FSB.
    "You people have too much time on your hands." - scottryan

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