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Thread: What buffer are you running in your middie?

  1. #71
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    Quote Originally Posted by BGREID View Post
    Has anyone had a gun malfunction from a heavy buffer? I am running H3 buffers in my middy's and they run great even with Wolf and Silver bear ammo. One of my middy rifles I am running an A2 stock and buffer, all are 16" barrels.
    This happens so seldom for me, the only time in recent memory was when a buddy's CMMG 16" carbine-gas piston upper (that ended up going back to CMMG to have the entire gas piston system replaced) malf'd with anything but an H-buffer. But that gun also needed a BCM extractor spring to run 100%, so I consider it an oddity.

    I seldom come across a non-SBR gun that won't lock back with an H3 using a stock Colt or BCM spring and a quality mag.

    As for "why f*ck with it?" Because it's a cheap upgrade that enhances your margin for reliable function AND smooths the recoil impulse for under $40. No other upgrade can do all that. The better question is" "why not experiment with it? It's an easily reversible alteration."
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  2. #72
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    I don't consider it an actual reliability upgrade at all when Colt and BCM already ship all their 100% reliable carbines with H buffers and I've personally shot a few 10K rounds through a carbine gassed Colt and BCM with an H buffer. Granted, I don't gum up my carbine with Frog Lube or any other ridiculousness...

    IMNSO the heavier the reciprocating mass, the slower the recoil impulse, the longer the dot dances and the harder it is to get back on target.

    I tried a VLTOR A5 and it was the most annoying thing I'd ever done to a carbine for that very reason.

  3. #73
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    Quote Originally Posted by samuse View Post
    I don't consider it an actual reliability upgrade at all when Colt and BCM already ship all their 100% reliable carbines with H buffers and I've personally shot a few 10K rounds through a carbine gassed Colt and BCM with an H buffer.
    Colt has also shipped ramped carriers and solid Polymer rifle buffers in the past. And Colt at one time, like everyone else shipped guns with Carbine buffers. We know none of that crap is acceptable.

    Now running an H in a carbean is certainly going to give you a mildly over-gassed gun that's more forgiving of crappy ammo. I don't find that approach to be bad. The H2 however most closely matched the physics of a rifle system.... which is the entire point of the A5.

    If you find the recoil impulse bothersome, I can't argue that. That's your preference, and you're clearly nuts.

    Granted, I don't gum up my carbine with Frog Lube or any other ridiculousness...
    I'd like to hear more about this. I don't typically read too many lube threads, but I've had good luck with froglube. But if it can cause problems, I'm all ears. I've seen Pappabear squeeze the dropper out of my bottles and end up with half a bottle in his gun and it's never been an issue other than getting everywhere.
    Last edited by markm; 03-03-14 at 13:31.
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  4. #74
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    Quote Originally Posted by CTI View Post
    I never paid ant attention to Middys cause I wasn't a fan but I am now as Im in the middle of building my first one. Does a certain buffer weight really make any difference in a Middy? Serious question here. As for my carbines 16" and 14.5" I have used both H and normal weight buffers and had no issues one way or the other, Im sure the H one slowed the action down slightly but it wasn't something needed/noticed by me. But as for Middys and me not knowing technical details about them yet I am curious if they run better with certain buffers? thanks guys
    What is a normal wight buffer. Most would assume a normal wight buffer is an H buffer being how that is now a military specification on the M4 platform.

    There's a reason why any AR worth buying comes standard with an H buffer and there's a reason why the military switched to the H buffer from a Carbine buffer.

  5. #75
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    Quote Originally Posted by Obscenejesster View Post
    There's a reason why any AR worth buying comes standard with an H buffer and there's a reason why the military switched to the H buffer from a Carbine buffer.
    Yep... they're still slow to get a clue. rsilvers did the math and the H2 is closest one can get to the Rifle system within the constraints of the Carbine action spring and RE.

    An H is a huge leap forward from a carbine buffer, but the H2 is still better than that on a carbine with the correct gas port... and the Mathematically (not subjective) correct answer.... assuming you agree that the rifle buffer system is optimal.
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  6. #76
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    Quote Originally Posted by markm View Post
    If it's a 16", an H2 is good. For a 14.5, I run the H. This is specific to BCM. Other middies have different (larger) ports.
    I run an H3 in my 14.5" BCM upper, runs great even with Wolf.

  7. #77
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    Quote Originally Posted by BGREID View Post
    I run an H3 in my 14.5" BCM upper, runs great even with Wolf.
    Mine ran the H3 too when it was new.... but I've had gas tube problems. My first tube was worn down at the carrier key and was puking gas forward. I couldn't see the build up under the rail. But when I pulled the tube it had worn down to about 0.163" on a spec of 0.180". Still haven't fully figured that one out.
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  8. #78
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    14.5" BCM EAG upper - I currently have an "H" buffer installed and while the upper was on the newer side it would not reliably cycle Wolf/Tula/weaker ammunition (mostly a failure to feed/short stroke); I am aware of the manufacturers comments regarding this. After a steady diet of about 1000 rounds of 5.56 spec ammo it has no issues with any type of ammunition attempted with the H buffer.

    The rifle shoots so softly already, I don't see much reason to experiment any further; and all other mid-lengths I own also do just fine with an "H." I only brought up the 14.5" because it was the sole example of a mid-length having any form of malfunctions.

  9. #79
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    My go-to/SHTF mid-length carbine (16" BCM) uses an H buffer with blue Springco and Springco 5 coil extractor spring. It is 100% reliable thus far and works with all ammo I've tried. I've tried an H2 and H3 and they also work just fine, but I want a greater margin of reliability with this particular weapon, so I don't chance it with what could be too heavy of a buffer if Murphy decides to show up at the wrong time. BCM ships with an H, so that is what I use. Call me unimaginative.

    I also have an 18" mid-length SPR that, so far, functions perfectly with an H3 and blue Springco, but I'm still trying to vet that one as it is new. We are getting some really cold days here in Minnesota and I have been able to test all of my guns by leaving the weapon and ammo outside for about an hour or two, then shoot around six mags loaded with 3 rounds each. If it locks back 100% on a -15 degree day, I will trust it. This method also tests my lube choice and I've found that Slip2000 EWL, FireClean, and Mobile 1 10w30 all work just fine at those temps. Grease, fyi, not so much.


    Quote Originally Posted by Iraqgunz View Post
    A Spike's ST-2 buffer is actually heavier than an H2 and lighter than an H3 (as I recall). The difference though is that they use powdered tungsten as opposed to tungsten weights.
    Just clarify, the ST-T2 is in between H and H2. My two samples weighed 4.0 and 4.1 ounces. I've seen them weighed as low as 3.8 ounces which is standard carbine territory. After watching the high-speed video of how they still allow some bolt bounce, I no longer use them in favor of a H or H2 buffer.

  10. #80
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    I knew it was in between something. Thanks for the clarification. I have never used them nor would I.

    Quote Originally Posted by tehpwnag3 View Post
    My go-to/SHTF mid-length carbine (16" BCM) uses an H buffer with blue Springco and Springco 5 coil extractor spring. It is 100% reliable thus far and works with all ammo I've tried. I've tried an H2 and H3 and they also work just fine, but I want a greater margin of reliability with this particular weapon, so I don't chance it with what could be too heavy of a buffer if Murphy decides to show up at the wrong time. BCM ships with an H, so that is what I use. Call me unimaginative.

    I also have an 18" mid-length SPR that, so far, functions perfectly with an H3 and blue Springco, but I'm still trying to vet that one as it is new. We are getting some really cold days here in Minnesota and I have been able to test all of my guns by leaving the weapon and ammo outside for about an hour or two, then shoot around six mags loaded with 3 rounds each. If it locks back 100% on a -15 degree day, I will trust it. This method also tests my lube choice and I've found that Slip2000 EWL, FireClean, and Mobile 1 10w30 all work just fine at those temps. Grease, fyi, not so much.




    Just clarify, the ST-T2 is in between H and H2. My two samples weighed 4.0 and 4.1 ounces. I've seen them weighed as low as 3.8 ounces which is standard carbine territory. After watching the high-speed video of how they still allow some bolt bounce, I no longer use them in favor of a H or H2 buffer.



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