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Thread: shooting low

  1. #1
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    shooting low

    Well I am new to ar's and I ended up purchasing a blackthorne kit. After reading some of the posts I see it may not of been the best decison. Anyway It is a 16" a3 flattop m4, with a Bang Arms lower, and a carry handle from blackthorne. The gun went together fairly easy and everything seems to work fine but It shoots 6-8" low at fifty yards. I read the faq for zeroing in iron sights and I have the front post all the way down. When I turn the rear sight all the way up it shoots pretty close but I know It is supposed to be bottomed out at fifty to 200. I was just wondering if there is anything I should check for this problem? Maybe a better quality carry handle? Or anything to look for with the upper? I was shooting remington 55 fmj ammo.

  2. #2
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    There are others that post here that know more than me.

    But I'd say you have the wrong front sight assembly for the flat top. They are a bit shorter on the flat top ARs.

  3. #3
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    You need to adjust your from sight post down further.
    Also adjust your rear sight so it's bottoming out 4 clicks below 6/3 if you have an A2 type rear sight.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  4. #4
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    The rear sight I have doesn't say 6/3 it has numbers like 1 thru 15. The front sight post is adjusted down as far as it will go. I don't know if this means much but on the side of the front sight it looks like there is a "s" cast into it.

  5. #5
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    If you can try again at 25yds and try for 1" low. Then check at 50yds. Sounds like one of the very cheap Chinese carry handles. If you can I'd get a either a RRA or Bushmaster one since you more than likely have a rifle height FSB.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  6. #6
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    The first time I went out and shot I was shooting at 25 yards and It was still low. I thought it was due to the cheap wolf ammo, so I went home and cleaned the gun and tried again but at 50 yards. same thing. The carry handle does feel very cheap. What is my fsb supposed to measure? I will try to get a better quality carry handle next week. I hope that cures the problem.

  7. #7
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    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  8. #8
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    Quote Originally Posted by gotm4 View Post


    I knew one of you guys had that pic.

    I just ran down stairs to measure mine. I have a BM A2 carbine and a RRA mid-length flat top and they are right on those measurements.

  9. #9
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    I measured my FSB and came up with 1.947. so it has the standard FSB. and that shoot make my flattop shoot high, right?

  10. #10
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    Quote Originally Posted by toypar View Post
    I measured my FSB and came up with 1.947. so it has the standard FSB. and that shoot make my flattop shoot high, right?
    Usually it'll require a taller front sight post like this one from Bushmaster for $5.50

    If you use the one thats in your FSB it'll probably require that to zero at 50yds your front sight post will be nearly falling out of the FSB.

    Also remember that moving the front sight up makes the group go down. This is opposite what the rear does where moving the rear sight left makes the group go left. When doing the 50yds zero the rear sight elevation is bottomed out like I said earlier 6/3 -4 clicks (4 clicks lower than it's lowest marked setting). The rear sight usually requires a 1/16" allen wrench to allow it to do this. During zeroing the only elevation changes are made at the front sight and windage is at the rear sight.

    This is complete directions for the Santose 50yd Zero.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

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