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Thread: Issue zeroing 20" A4-ish clone with carry handle

  1. #21
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    Can you borrow another carry handle or do you have a carry handle on another weapon you own that you could swap with the one currently on your rifle? If you have the same issues, that would eliminate the possibility there is an issue with the carry handle.
    Train 2 Win

  2. #22
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    Quote Originally Posted by Iraqgunz View Post
    Please tell me how he will simply remove and replace FSB's? It doesn't work that way.
    That is not something he could do at home. It would have to be done by a gunsmith who has the machinery to properly drill the holes for the taper pins on the FSB.

    Unless this is a target rifle for shooting matches out to 600 yards or even farther, I would accept a 200 yard zero with the rear sight elevation wheel at 12 clicks from the bottom and not worry about it.
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  3. #23
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    No actually a gunsmith can't do it either. The taper pin holes vary from company to company and unless you had someone who 100% knew what he was doing, you would probably trash the barrel. If it is off just a little the taper pins will no longer hold the FSB correctly.

    Quote Originally Posted by T2C View Post
    That is not something he could do at home. It would have to be done by a gunsmith who has the machinery to properly drill the holes for the taper pins on the FSB.

    Unless this is a target rifle for shooting matches out to 600 yards or even farther, I would accept a 200 yard zero with the rear sight elevation wheel at 12 clicks from the bottom and not worry about it.



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  4. #24
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    Quote Originally Posted by Iraqgunz View Post
    No actually a gunsmith can't do it either. The taper pin holes vary from company to company and unless you had someone who 100% knew what he was doing, you would probably trash the barrel. If it is off just a little the taper pins will no longer hold the FSB correctly.
    If I were to bother with changing the FSB, I would not take it to the local gun shop. I would take it to someone who has a good reputation and a great deal of experience with AR-15s. Unless the rifle is going to be used as a match rifle, I doubt I would spend that kind of money.

    I ran into this issue with a mutt parts gun I built years ago. I wanted a 200 yard zero with M193 at the lowest rear sight elevation, so I could change the sight setting without looking at the weapon. I determined how many clicks up from bottomed out I had to go on the rear sight wheel to zero, then installed a stop underneath the rear sight assembly.

    Anyway this issue is corrected, I would prefer to see a little more front sight above the FSB when the weapon is zeroed.
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  5. #25
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    Can you shoot a pic of the rear peep sight for us?
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  6. #26
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    Im not going to be replacing the FSP or anything like that. This gun is a fun plinker gun for me. It will most likely never be anything more than that unless it becomes a trunk gun. STILL I would like to have the zero be right. IM ok if I have to use a combo of front and rear to get there, if thats what it takes, just found it odd that I couldnt get it zero'd via the IBZ methodology.

    I dont know if I will have time to go shoot the gun again for a week or 2 since I am leaving saturday on vacation. Might have time tomorrow morning though to get out and see whats up.

    F2S:


  7. #27
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    Fastest and easiest solution is to swap rear handles.

    As I wrote before -- there are four rear sight shelf heights. Here's a comparison of what I think you have (on the left) and a GI handle on the right (note where the bottom of the windage drum sits in relation to the elevation knob):



    Alternatively (and a lot of work) would be to bring up the front sight. Drive out the rear sight pin, remove the sight, place an appropriate shim or washer around the sight column (so the base sits on it), and replace the pin. Crank to lowest setting and re-zero. Done.
    Attached Images Attached Images

  8. #28
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    rjacobs, I know this doesn't help you but I just shot my LMT 10.5" w/ carry handle. I zeroed it at 100 yards. It was shooting high at 6/3-6 with the front sight at mechanical zero, just like every other one I've ever shot...

    I'd swap rear sights and see what happens. Anything else is going to mean replacing the barrel and FSB.
    Why do the loudest do the least?

  9. #29
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    Quote Originally Posted by sinister View Post
    Fastest and easiest solution is to swap rear handles.

    As I wrote before -- there are four rear sight shelf heights. Here's a comparison of what I think you have (on the left) and a GI handle on the right (note where the bottom of the windage drum sits in relation to the elevation knob):



    Alternatively (and a lot of work) would be to bring up the front sight. Drive out the rear sight pin, remove the sight, place an appropriate shim or washer around the sight column (so the base sits on it), and replace the pin. Crank to lowest setting and re-zero. Done.
    ^^^^^^^^
    Good information.

    How would you determine the shim thickness before removing the rear sight?
    Train 2 Win

  10. #30
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    Op,

    If you are going to be doing a lot of your own work, I suggest picking up a Vernier caliper with a dial or digital readout and using the sight correction formula to determine front sight changes. I've been using this method for years and it has saved me a tremendous amount of time zeroing M1 Garands, M1As, M1 Carbines, etc. I also use it for calculating how much to change the front sight elevation on an AR.

    Correction Formula: Amount of Error x Sight Radius/Distance to Target = Sight Correction (All values are in inches)
    Last edited by T2C; 06-09-16 at 14:58.
    Train 2 Win

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