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Thread: McFarland Gas Ring vs. Standard

  1. #101
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    Quote Originally Posted by C4IGrant View Post
    I was wondering why I was selling so many of these recently.




    C4
    Someone had to get the ball rolling.


    Quote Originally Posted by BufordTJustice View Post
    I've been using Grant's McFarland rings on my AR's since January 2009. In all my buddies' guns since mid 2009.

    Many thousands of aggregate rounds (with between 3k and 5k on each individual ring set) and they all still look and function as when they were brand new.

    There is a reason that they have been recommended as part of the PIP for the Navy's Mk18 10.5" gun. McFarland's come standard on all new Mk18's and they have already demonstrated superior performance and longevity in Navy testing.
    Thats interesting about the MK18, is there any public files to view about this?

    Main reason i looked up this thread was because of the 2003ppt. About the CQB-R had these in it.
    Last edited by sinlessorrow; 05-02-12 at 15:06.

  2. #102
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    So a month or so ago one of the rings in my Larue BCG broke so I replaced them with the MacFarland.

    It was uber tight to begin with and I expected that. But now after less than 500 rounds the rings will no longer support the weight of the carrier and the bolt nearly falls out under its own weight.

    Gun functions just fine though so I am inclined to leave it alone.

  3. #103
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  4. #104
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    Quote Originally Posted by BufordTJustice View Post
    McFarland's come standard on all new Mk18's and they have already demonstrated superior performance and longevity in Navy testing.
    Can you please provide documentation of this.

  5. #105
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    Quote Originally Posted by 6933 View Post
    Can you please provide documentation of this.
    "– CQB Receiver –
    M4A1 Carbine with
    10-Inch Upper Receiver"

    "Presented by Jeff Johnson
    Weapons Department
    Ordnance Engineering Directorate
    Naval Surface Warfare Center – Crane, Indiana"

    The PDF is public domain, released by NAVSEA/Crane.

    www.dtic.mil/ndia/2003smallarms/john.ppt

    Slides 8 & 9


    Also here:

    https://www.m4carbine.net/showpost.p...2&postcount=44
    Last edited by BufordTJustice; 05-03-12 at 05:43. Reason: Add info

  6. #106
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    Quote Originally Posted by BufordTJustice View Post
    "– CQB Receiver –
    M4A1 Carbine with
    10-Inch Upper Receiver"

    "Presented by Jeff Johnson
    Weapons Department
    Ordnance Engineering Directorate
    Naval Surface Warfare Center – Crane, Indiana"

    The PDF is public domain, released by NAVSEA/Crane.

    www.dtic.mil/ndia/2003smallarms/john.ppt

    Slides 8 & 9


    Also here:

    https://www.m4carbine.net/showpost.p...2&postcount=44

    Thanks so much, excellent information.

  7. #107
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    I've had a little experience with these rings. What I've found is they can be completely different diameters, from the same source.

    I know that Armalite sends these out with every AR10 BCG that goes out their door. However, the 308 action is very different - you really almost CAN run an AR10 BCG without gas rings. My AR10 BCG is as loose as it was day one and it's been 100% reliable.

    Back to the 5.56 versions, I've even swapped around these gas rings on various BCGs to verify it wasn't the BCG that was different dimensions. I own 5 of them (experiement) - each seems to have it's various dimensions. Some are so tight I have to force the bolt into the carrier, some are so loose it drops right in. I've never taken the time/ammo to do any real testing with them and have pretty much resorted to regular rings on a maintenance schedule.

    I still have all of the rings. It's good to hear many are very pleased. Have you all seen this much variance in manufacture between the different rings? I wish somebody would say, it doesn't matter. I know Armalite gives an acceptable variance measurment on their website - 'cept I don't have a micrometer.
    Last edited by Brahmzy; 05-03-12 at 10:51.

  8. #108
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    Had to order some stuff from DSG last week so I threw a couple McFarland rings on the order based on some of the recommendations in this thread. Both of them have an OD of 0.5025". I'll be PMing my Noveske upper in the near future and installing one.

  9. #109
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    mine will be here tomorrow to go on my Bolt with around 1,500 rounds on it so well see how it does

  10. #110
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    I'M going to be switching out standard gas rings shortly on by BushMaster and Colt and will also go with the McFarland rings this time a round.

    Will report back later with results.
    We are all inclined to judge ourselves by our ideals; others, by their acts.

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