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Thread: McFarland Gas Ring vs. Standard

  1. #121
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    Quote Originally Posted by SteveL View Post
    I only have the one (IIRC it came from Grant as well). I just saw someone mention above that their size can be inconsistent but I have no way to know for sure without getting some more to compare to.
    Some are but I think Grant takes great pride in making sure the ones he gets are all to the correct spec.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  2. #122
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    Quote Originally Posted by Dport View Post
    Gas rings? Oh you guys must still be using DI uppers. Gotcha.

    Oh geez, here we go...

    Unless you're running an HK416 then I'd wager that my DI BCM is likely a step ahead of whatever piston system you're running. Get with the times, mang!

  3. #123
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    Quote Originally Posted by sinlessorrow View Post
    Some are but I think Grant takes great pride in making sure the ones he gets are all to the correct spec.
    When I said I got it from Grant, I hope that didn't come across as a stab at him. That wasn't the case. I've never gotten anything but top-notch service from Grant, but to be quite honest it's a $3 part and I haven't lost any sleep over it not working out for me.
    Steve

  4. #124
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    I may have been able to get a couple thousand more rounds out of that one but I use that upper for HD so I didn't feel comfortable with it. I replaced it with some new standard rings that I had. I may order some McFarlands from Grant and try one of them when these rings wear out. DSG has two different part numbers listed for their rings so its hard to tell what you're getting.

  5. #125
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    Quote Originally Posted by djmorris View Post
    Oh geez, here we go...

    Unless you're running an HK416 then I'd wager that my DI BCM is likely a step ahead of whatever piston system you're running. Get with the times, mang!
    I run HK and.... it has gas rings

    I actually prefer gas rings to wear out instead of piston or cylinder. They are easy to diagnose before they fail and then easy and cheap to replace.

    BTT I had McFarlan ring installed in my Stag (it was only AR15 avaliable in Poland 7 years ago) and zero problems in several K rounds. Next owner also had no problems with it. Initially it was rather tights inside cylinder (bolt carrier), but loosened up a little in first thousand rounds and then stayed this way.
    Montrala

    I'm sponsored competition shooter representing Heckler&Koch, Kahles, Hornady and Typhoon Defence brands in Poland, so I can be biased

    http://montrala.blogspot.com

  6. #126
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    Quote Originally Posted by montrala View Post
    I run HK and.... it has gas rings

    I actually prefer gas rings to wear out instead of piston or cylinder. They are easy to diagnose before they fail and then easy and cheap to replace.

    BTT I had McFarlan ring installed in my Stag (it was only AR15 avaliable in Poland 7 years ago) and zero problems in several K rounds. Next owner also had no problems with it. Initially it was rather tights inside cylinder (bolt carrier), but loosened up a little in first thousand rounds and then stayed this way.

    Lol I was about to bring up that the Hk416 had gas rings. Gas ring systems are good for the reasons montrala mentioned, they form the seal not a steel on steel seal.
    Last edited by sinlessorrow; 11-20-12 at 14:05.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  7. #127
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    Quote Originally Posted by montrala View Post
    I run HK and.... it has gas rings

    I actually prefer gas rings to wear out instead of piston or cylinder. They are easy to diagnose before they fail and then easy and cheap to replace.

    BTT I had McFarlan ring installed in my Stag (it was only AR15 avaliable in Poland 7 years ago) and zero problems in several K rounds. Next owner also had no problems with it. Initially it was rather tights inside cylinder (bolt carrier), but loosened up a little in first thousand rounds and then stayed this way.
    My 6940P has gas rings too. On the bolt in the normal location and also on the piston.

  8. #128
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    Quote Originally Posted by QuickStrike View Post
    My 6940P has gas rings too. On the bolt in the normal location [...].
    This makes prefect sense. Rings on bolt, when do not seal gases in "DI" configuration, also work as a guide to centre bolt tail inside carrier. HK uses modified bolt, with special "guide" surfaces, so does not need ring on bolt any more, but if "piston AR" uses "standard" bolt, then rings are still needed here.
    Montrala

    I'm sponsored competition shooter representing Heckler&Koch, Kahles, Hornady and Typhoon Defence brands in Poland, so I can be biased

    http://montrala.blogspot.com

  9. #129
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    Quote Originally Posted by wolf_walker View Post
    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.
    From what I understand of combustion engines, rings will press against the cylinder wall under the compression stroke.

    Further, with a McFarland, you have only 1 "gap". With the regular gas-rings, you have 3 "gaps". This means to me that the regular rings can have much more variance and still make up for it with expansion that, since each ring has its own "gap", will not harm function nearly as much as an out of spec McFarland---whether through use or manufacture or foreign debris.

  10. #130
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    Quote Originally Posted by Submariner View Post
    Homie, you're cheap!
    Don't say cheap, say thrifty.

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