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  1. #1
    CS223 is offline Cast Iron
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    Looking for a print or diagram for the AR15 barrel extension; dimensions & tolerance. I could mic one but I'm trying to avoid tolerance stacking and possible errors. A 9mm AR barrel print would be a bonus. Thanks.

  2. #2
    kilroyjones is offline Hot Rolled
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    Ar15.com the leading forum in all things AR related.

    Try asking over there and someone might be able to help you. I can't recall ever seeing detailed prints for any AR parts, but they must be out there...

  3. #3
    CS223 is offline Cast Iron
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    I've got querys out on several boards.

  4. #4
    GGaskill is offline Stainless
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  5. #5
    CS223 is offline Cast Iron
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    Nothing in the AR15.com library. Plenty of Lower receiver info. Need a source of info akin to what Kuhnhausen publishes but at the moment just the barrel extension info is all I need.

  6. #6
    WILLEO6709's Avatar
    WILLEO6709 is offline Diamond
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    The barrel extension is 0.9980/0.9995 I think, not near a print right now. The upper receiver bore is 0.999/1.000 for the first inch I think.

  7. #7
    garyphansen is offline Titanium
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    This question poped into my head the other day. What are the AR15 Barrel threads? Are they metric? The reason the question poped into my head is a friend was talking about rebarreling his and he was maybe hinting that he wanted me to do it. However, I can not cut metric threads on any of my lathese without buying same more gears. Gary P. Hansen

  8. #8
    MilGunsmith's Avatar
    MilGunsmith is online now Hot Rolled
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    Threads are .8125-16UNF. Use a new barrel extension. Brownells sells them as do others. Barrel nut is 1.25"-18. Flash suppresor is 1/2"-28

  9. #9
    kilroyjones is offline Hot Rolled
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    Here is the specs for the barrel thread....

    web page

    1 3/16-16 UN on the barrel shank that threads on to the extension.

  10. #10
    CS223 is offline Cast Iron
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    The barrel extension is 0.9980/0.9995 I think, not near a print right now. The upper receiver bore is 0.999/1.000 for the first inch I think.
    If you find a print, it would be most helpful. Trying to determine the od of the rear portion of the extension, the dia of the ring, the distance from the ring face to the breech face. Need this info for a 9mm barrel that is turned from a solid piece of barrel, no barrel extension. TIA

  11. #11
    MilGunsmith's Avatar
    MilGunsmith is online now Hot Rolled
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    As per US Army drawings. Recheck the drawing specs on that web sight. It says 13/16-16UN not 1-3/16",.8125" is 13/16".

  12. #12
    Dtech is offline Aluminum
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    The barrel-shank is .8125-16. I make mine .619" from the shoulder to the end of the shank. Use your threading cutter to cut a chamfer on the outside edge of the shank. You will need a thread-relief groove at the shoulder or the barrel-extension will not thread up to the shoulder. I use .100" groove, and only go the depth of the threads.

    Hope that helps...

  13. #13
    CS223 is offline Cast Iron
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    Still looking for the toleranced dimensions for the AR15 barrel extension. Anybody know where to obtain dimensional prints for the component parts? Something like a Kuhnhausen reference?

  14. #14
    CyberK is offline Plastic
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    Just wanted to revive this thread as I am looking for the same information. I would like to get some barrel extensions manufactured as they are not easy to get here in Canada. Also looking for good, preferably factory, blueprints for the upper receiver.

  15. #15
    CS223 is offline Cast Iron
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    Quote Originally Posted by CyberK View Post
    Just wanted to revive this thread as I am looking for the same information. I would like to get some barrel extensions manufactured as they are not easy to get here in Canada. Also looking for good, preferably factory, blueprints for the upper receiver.
    The only prints you will find will be reverse engineered. Colt retains the rights to the AR15 platform & prints. The only time they become available is when the U.S. Gov't puts the weapon manufacture up for bid. You have to be a qualified bidder and sign a NDA to get a copy of the original prints.

  16. #16
    bbemory is offline Cast Iron
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    Cyberk
    PM me if interested in flat top DWG's

  17. #17
    CyberK is offline Plastic
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    Does anyone know of someone that is currently manufacturing barrel extensions, or who would like to? I need a few and can't seem to get my hands on any.

  18. #18
    MilGunsmith's Avatar
    MilGunsmith is online now Hot Rolled
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    Did you try Brownells?

  19. #19
    CyberK is offline Plastic
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    Quote Originally Posted by MilGunsmith View Post
    Did you try Brownells?
    They are out of stock right now. So far they are my best bet as most places are either out, or they won't ship to Canada.

  20. #20
    CyberK is offline Plastic
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    Still looking for some of these. Need two A2 and two M4. Will pay top dollar for in stock parts with super fast shipping!!!!

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