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Thread: SR-15E3...

  1. #41
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    You don't have a problem with a loose bbl nut or anything like that.
    ANY free floated bbl inside of a long free float rail, is going to have the "flex" you talk about. That's normal for a free floated bbl. That's why it's never a good idea to use a bayonet on a free floated bbl.
    The URX rail isn't sitting straight/parallel to the bbl because of the rail being tightened down on the threading of the URX/Upper receiver.
    (threads are cut on an ANGLE)
    "ROLL RIGHT SNIPER!"

  2. #42
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    Razorhunter,
    So are you saying the threads on the urx are supposed to be cut on an angle or that the reason that my rear sight is so far off because my threads on the urx are cut on an angle. I know all f.float tubes have some flex but this one seems a little more than normal compared to a few of my other mid-length f.float tubes. Unfortunately I know no one or any local shops that have one I can compare the two side by side. Thanks for your help.

  3. #43
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    I measured mine. There is an approx. 1/16" difference between the gas block and the rails on either side. No idea what this translates to in terms of zeroing. I'm still planning on that tomorrow.

    But to echo what was already said, I have confidence in KAC fixing any problem that a customer of theirs might have. They already took care of me with an issue that wasn't even their fault.
    Last edited by RAM Engineer; 09-06-09 at 23:27.

  4. #44
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    Buddy of mine had problems with his KAC.
    Both of the problems were KAC. He shipped it back to them (on his dime) and they fixed the problem. Second problem occurred in class (front sight lost it's button and it was flopping loose), and he sent it back (on KAC dime) for repairs/replacement. Based on what I heard from him, he's still satisfy with KAC even though he probably was one of the rare unlucky people with the rifle. I do have to say it's a nice rifle and it sounded like KAC took care of him.

  5. #45
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    Call and get a RMA number and ship it to us to take a look at. If a part is out of spec we will fix it.
    Last edited by III; 09-07-09 at 13:21.
    C Reed Knight III
    Knight's Armament Co.
    http://www.knightarmco.com/

  6. #46
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    As was stated by Trey, if anyone has issues with any KAC/KMC items please email me, I will put you in touch with the personnel that will issue you a RMA (Return Material Authorization) and we will fix whatever the issue is.

    We did notice that a small lot of the P/N 20549 Midlenght URX II rail with integral front sight where not bored correctly, and that lot was condemed and scrapped, we have not had any reports or observed that occuring since.

    If anyone has a URX like this please email me and we will replace it, as that is NOT the norm for this part.


    The URX threads on the upper - so if the upper is threaded off center it will affect the URX as well.
    Kevin S. Boland
    Manager, Federal Sales
    FN America, LLC
    Office: 703.288.3500 x181 | Mobile: 407-451-4544 | Fax: 703.288.4505
    www.fnhusa.com

  7. #47
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    Quote Originally Posted by Ryo View Post
    Buddy of mine had problems with his KAC.
    Both of the problems were KAC. He shipped it back to them (on his dime) and they fixed the problem. Second problem occurred in class (front sight lost it's button and it was flopping loose), and he sent it back (on KAC dime) for repairs/replacement. Based on what I heard from him, he's still satisfy with KAC even though he probably was one of the rare unlucky people with the rifle. I do have to say it's a nice rifle and it sounded like KAC took care of him.
    Hey, I know that guy. Oh wait he's me!

    I'll be first to admit my E3 IWS was a bit of a problem child at first. I won't go in to the exact issues, but I want to go ahead and say that of any company I've ever had to send something back to for repair/replacement that KAC was the coolest and most professional one I've seen.

    Despite a few issues of all of my guns I'd say the KAC is the one I'd trust with my life.
    "There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."

  8. #48
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    Quote Originally Posted by F.C.III View Post
    Razorhunter,
    So are you saying the threads on the urx are supposed to be cut on an angle or that the reason that my rear sight is so far off because my threads on the urx are cut on an angle. I know all f.float tubes have some flex but this one seems a little more than normal compared to a few of my other mid-length f.float tubes. Unfortunately I know no one or any local shops that have one I can compare the two side by side. Thanks for your help.


    FCIII,

    As stated, I doubt you have a problem due to that "flex". I have owned a number of AR's with free floated bbls, and all of them have that flex you are speaking of. The longer the rail is, the more "flex" you will sometimes notice, and this is because of simple physics. If you only have a short, 7" length rail on your upper, you don't notice this "flex" nearly as much like you would with a longer 10 3/4" URX rail.
    I haven't personally handled your upper, but I'm betting the amount of "flex" you have is quite normal, and nothing to be worried about.


    -I have owned about 5 E3's/E3 uppers. (ONLY one of these 5 E3's had sighting issues, where the sight had to be shifted all the way to one side. KAC fixed the single issue I had, and I'm a satisfied customer)

    -My evaluation of my personal upper, seemed to be that the URX rail was sitting slightly off center, at an angle (not parallel to the bbl), and this indeed may be because of what Kevin has mentioned above. Regardless, KAC fixed it, and all is well.
    In regards to the flip up front sights coming loose, I have started loctiting the tiny roll pins of all my flip up front URX sights. If by chance loctite does not work, I will move to Rocksett obviously.
    Just for the record, I have only had a couple front sights come loose. The other 3 E3's I have run/owned, have not had any issue with the front sights.
    The front sight problem seems to be somewhat rare, and only seems to be an issue when you run the gun HARD in a class, shooting large numbers of rounds in a short amount of time.
    As stated, it's an easy fix with Loctite/Rocksett.

    These E3's have been my favorite all time carbines to date, and I've owned just about all makes and models of AR to date.

    I just wish we could get the 11.5"/14.5" SR16 uppers with KAC FSGB made available to us!
    Last edited by Razorhunter; 09-07-09 at 23:19.
    "ROLL RIGHT SNIPER!"

  9. #49
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    I must say thats good customer service right there. I knew they would fix it, but to get on here on their day off and being labor day says alot. They should be out having a leisurely day off instead their on here taking care of their customers. I must say that is OUTSTANDING CUSTOMER SERVICE!

  10. #50
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    Smile

    Quote Originally Posted by F.C.III View Post
    Razorhunter,
    So are you saying the threads on the urx are supposed to be cut on an angle or that the reason that my rear sight is so far off because my threads on the urx are cut on an angle. I know all f.float tubes have some flex but this one seems a little more than normal compared to a few of my other mid-length f.float tubes. Unfortunately I know no one or any local shops that have one I can compare the two side by side. Thanks for your help.
    I have one in stock you can look at it whenever you need to just call I will help you.

    Joe Barnsfather
    SUPERIOR FIREARMS LLC.
    5510 Fern Valley RD. STE 102
    Louisville KY. 40228
    502-365-2244

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