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Thread: Am I "over-buffered"????? H2 Buffers...

  1. #11
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    As M4 has said, put one round in several mags to see what you get.

    TAP ammo has been known to be underpowered when compared to XM193 or M855.

    Your weapon is also very new (read tight). So there coule be many possible causes here.

    Generally speaking, most any 16" weapon with a carbine gas system will be able to run an H, H2 or even an H3 buffer.

    I even have a Noveske 10.5 that uses an ISMI spring and an H3 buffer. Generally speaking, this combo doesn't work together very well.



    C4

  2. #12
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    Quote Originally Posted by gotm4 View Post
    My diagnosis is that the ammo is too weak and the rifle too new to work with both an H2 buffer and an ISMI spring. Later on when the rifle has maybe 5-10K rounds through it, it should work 100% with both at the same time.
    I would tend to agree.

    If you have read through my How it works thread, you can see that failure of the bolt to lock back is classic short stroking.
    Either mag springs are weak or gun is under-gassed or over-buffered.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  3. #13
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    If you had no malfunctions what made you decide to switch to a heavier buffer? With proper maintenance, that gun should run great forever right out of the box.

    Stephen

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    Quote Originally Posted by Stephen_ATS View Post
    If you had no malfunctions what made you decide to switch to a heavier buffer? With proper maintenance, that gun should run great forever right out of the box.

    Stephen

    As you know, an AR will run just fine with a carbine buffer. The heavier buffer CAN increase reliability and also reduce felt recoil which in return leads to faster follow up shots. There is however a fine line between too much buffer and just perfect.



    C4

  5. #15
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    Quote Originally Posted by Stephen_ATS View Post
    If you had no malfunctions what made you decide to switch to a heavier buffer? With proper maintenance, that gun should run great forever right out of the box.

    Stephen
    Reading on the internet made him do it.
    It's obvious that a bunch of armchair commandos know more about weapons design than Colt does...
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  6. #16
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    Quote Originally Posted by AR15barrels View Post
    Reading on the internet made him do it.
    It's obvious that a bunch of armchair commandos know more about weapons design than Colt does...

    There are a lot of armchair commandos putting bad info out there, but running an H2 buffer isn't one of them.

    Colt 6920's come with H buffers and have even seen a couple with H2's.

    Military issued M4's now come with H2 buffers.



    C4
    Last edited by C4IGrant; 02-26-07 at 16:10.

  7. #17
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    Quote Originally Posted by C4IGrant View Post
    There are a lot of armchair commandos putting bad info out there, but running an H2 buffer isn't one of them.

    Colt 6920's come with H buffers and have even seen a couple with H2's.

    Military issued M4's now come with H2 buffers.

    C4
    But they still come (and run) with "cheap" USGI buffer springs.
    "The very purpose of a Bill of Rights was to withdraw certain subjects from the vicissitudes of political controversy, to place them beyond the reach of majorities and officials and to establish them as legal principles to be applied by the courts." Justice Robert Jackson, WV St. Board of Education v. Barnette, 319 U.S. 624 (1943)

    "I don’t care how many pull ups and sit ups you can do. I care that you can move yourself across the ground with a fighting load and engage the enemy." Max Velocity

  8. #18
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    Quote Originally Posted by Submariner View Post
    But they still come (and run) with "cheap" USGI buffer springs.
    Yes they do, but there are better options out there.


    C4

  9. #19
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    I have had issue related to this topic so i will ask about it. I have a BM patrolmans carbine, with roughly around 350 rnds through it. Being it is winter, tax return time I decided to try, at the recomendations here an ISMI spring and H2 buffer. It would fully function only with American eagle 55grn. .223, korean 55grn 5.56, and ADCOM 62grn 5.56. The Wolf 55grn .223, and brit. 62 grn 5.56 would not. I changed the buffer back to carbine weight, same results. I changed to standard spring and H2 buffer, ran like a top. Reading the above maybe i will wait and try ismi spring again in a few k rounds. But was also curious as to other possibilities. Temperature, it was in the teens when i did this. May be lube gummed up. I have grease on buffer spring and kel-lube on rest. also noted that BM non mil spec receiver extension is longer than standard mil spec. Could this dimension alter performance of the spring?

  10. #20
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    In a couple of batches of RRA Gov Carbines and Colt M4s, H2 buffers became necessary to prevent malfunctions with certain loads in burst and automatic fire. In semi-auto, any buffer worked fine.

    IMHO, I don't find that there's a substantial enough difference in felt recoil, or other variable, to warrant a change to the H, H2, or greater unless there's a functional issue.

    There is a point of diminishing return when you increase the mass of the buffer (and bolt carrier), and/or the resistance of the action spring. You can get too close to the functional threshold of the gun in a hurry without careful balancing of the components. Add now the economy/import/junk ammo so many use, and there's a recipe that's anything but "improvement."
    2012 National Zumba Endurance Champion
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