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Thread: Serious Problem with DD Fixed Irons on BCM Rifle

  1. #11
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    Quote Originally Posted by Thunderpigeon View Post
    Do you have the tools to measure the height of the front post?
    Sorry I missed this. Yes, I have a good set of digital calipers, so I’m sure I could get this done.

  2. #12
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    Is it possible the front sight is intended for a rail gas block, not a handguard rail? How different are the front and rear sight heights measured from the rail? Not post and aperture, the entire sight.

    By the way, a 25 yard zero crosses the sight line again at 400 yards. The height of the sights over the bore makes an AR entirely different from an M1/M1 Carbine.

    Andy
    Last edited by AndyLate; 10-17-20 at 19:22.

  3. #13
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    Quote Originally Posted by AndyLate View Post
    Is it possible the front sight is intended for a rail gas block, not a handguard rail? How different are the front and rear sight heights measured from the rail? Not post and aperture, the entire sight.
    Andy
    I cannot presently give an answer either of those, but assume DD can regarding the front. Once I have the upper back in hand, I can measure and answer the latter.

  4. #14
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    If BCM can get it zero'ed at 25 with different sights, then I am sure DD will get the problem sorted. DD are great sights.

    Andy

  5. #15
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    Just to clarify, are you trying to get point of aim to match point of impact at 25 yards? If so, thatís not typically how it is done.

  6. #16
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    Quote Originally Posted by OdinIII View Post
    Just to clarify, are you trying to get point of aim to match point of impact at 25 yards? If so, that’s not typically how it is done.
    ...it is and has been by the Army for decades.
    Sic semper tyrannis.

  7. #17
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    Quote Originally Posted by Wake27 View Post
    ...it is and has been by the Army for decades.
    Correct, but for most civilians it isnít desirable to be ~6Ē off at 100 yards.

  8. #18
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    Quote Originally Posted by OdinIII View Post
    Just to clarify, are you trying to get point of aim to match point of impact at 25 yards? If so, thatís not typically how it is done.
    Literally everyday with M4s and M16s numbering on a scale that makes the entirety of this site look pathetic.
    RLTW
    ďYep, it's definite. I simply don't care enough what you think.Ē -SteyrAug

  9. #19
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    Quote Originally Posted by Patrick_B View Post
    Not sure how that will work out if Iím this low at 25 with no adjustment left, but Iím willing to learn.



    Thatís interesting, and I will look around. Iíve come across a couple of early featured M1 Carbines with sight blades too tall, and had to deal with that. A whole lot would have to come off this one, so I will look into that. Perhaps DD will shed some light on this for me as well.

    Thank you both...
    You dont understand bullet trajectory. Shoot it a 100 and see your point of impact.
    "Freedom is never more than one generation away from extinction. It has to be fought for and defended by each generation."
    Ronald Wilson Reagan

  10. #20
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    Quote Originally Posted by Patrick_B View Post
    Not sure how that will work out if Iím this low at 25 with no adjustment left, but Iím willing to learn.
    1.5" low at 25 yards is basically a 100 yard zero on an AR because of the sight height over bore. A 25 yard zero requires a pretty steep trajectory and the POI would cross the POA again at 400 yards.

    All academic, I would be displeased if I had to bottom out the front sight to zero at 100 yards. Hopefully DD takes care of you.

    Andy
    Last edited by AndyLate; 10-19-20 at 06:51.

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