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Thread: McFarland Gas Ring vs. Standard

  1. #61
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    MacFarland rings may work in theory, but the half-dozen I ordered from Brownell's were all grossly undersize and got sent back. For what it's worth, I have yet to come across an out-of-spec conventional gas ring.

    I can tell you this: undersized MacFarland rings allow a heck of a lot more gas blowby than standard rings even with the 3 gaps lined up.
    Oh no, not another lube thread! Read this first: Lubrication 101.

  2. #62
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    Had one piece in my cmt bolt in a bcm upper for 3000+, no problem. Same with standard rings. Curiosity gets the best of me and I get burned sometimes. This was not the case here. Either type has treated me right, never had a gas ring alignment issue with any rings.

  3. #63
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    I have put 5K rounds through my SBR with McFarland rings- no issues at all. I have used them in other AR's as well. Again ZERO problems. YMMV.



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  4. #64
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    IG, you've thrown a lot more lead than me, so a question. Have you ever had a gas ring problem with any rings?

  5. #65
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    Standard gas rings are 302 or 304 stainless (either is ok).

  6. #66
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    Quote Originally Posted by kartoffel View Post
    MacFarland rings may work in theory, but the half-dozen I ordered from Brownell's were all grossly undersize and got sent back. For what it's worth, I have yet to come across an out-of-spec conventional gas ring.

    I can tell you this: undersized MacFarland rings allow a heck of a lot more gas blowby than standard rings even with the 3 gaps lined up.
    There has been more thane a few threads on undersized mc,farland gas rings. If my memory is correct most of them came from brownell's.

  7. #67
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    Gapless rings on a piston is not even remotely a new idea. Manufacturing defects aside, they will seal better than gapped rings. This in and of itself seems to be a problem, hence the bolt drag comments. There longevity should be based on material, not design.

  8. #68
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    I have had MacFarland rings on a couple 6920's for the past four years. No problems and very little wear.
    Praise be to the LORD my Rock, who trains my hands for war, my fingers for battle. Psalm 144:1

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  9. #69
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    Quote Originally Posted by Thomas M-4 View Post
    There has been more thane a few threads on undersized mc,farland gas rings. If my memory is correct most of them came from brownell's.
    So, any reliable sources of MacFarland rings?

    I took a chance with Brownell's, even after reading of the problem a couple months before placing my order. I (wrongly) assumed they would have fixed the problem.

    Lo and behold, they sent me undersized rings. I returned them with a letter explaining WHY they were unacceptable, and HOW to measure their existing inventory of rings to cull the rejects.

    It's been about a year since then. Maybe I'll order another couple rings from Brownell's just to see if they've taken any remedial actions.
    Oh no, not another lube thread! Read this first: Lubrication 101.

  10. #70
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    All 200-ish that I purchased back in 2008 when I was in Iraq came from Brownells. They all worked.

    http://www.lmgtfy.com/?q=McFarland+gas+rings

    http://dsgarms.com/ProductInfo/ARMEB0121.aspx

    http://www.armalite.com/ItemForm.aspx?item=EB0121

    http://www.midwayusa.com/viewproduct...tnumber=163933

    http://www.gandrtactical.com/cgi-bin...ategory%3DMFAR

    Quote Originally Posted by kartoffel View Post
    So, any reliable sources of MacFarland rings?

    I took a chance with Brownell's, even after reading of the problem a couple months before placing my order. I (wrongly) assumed they would have fixed the problem.

    Lo and behold, they sent me undersized rings. I returned them with a letter explaining WHY they were unacceptable, and HOW to measure their existing inventory of rings to cull the rejects.

    It's been about a year since then. Maybe I'll order another couple rings from Brownell's just to see if they've taken any remedial actions.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

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