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Thread: buffers w/non-milspec barrel ports

  1. #1
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    buffers w/non-milspec barrel ports

    I know the buffer thing has been ebat to death, and I DID search - for about an hour - but didn't get exactly the answer I was seeking.

    Here's the issue.

    So I have an SBR upper, and Ive been loaned for a week or so a differant upper to try. Here's the rub - it's an 11.5" upper from Rock River Arms. Yeah, I know - not really top of the chart - but for the price [read; free] I'll play with it.

    Now, if I understand correctly, RRA tends to run their gas ports larger than mi-spec? Or perhaps I'm wrong on that?

    If that is so, then theoretically, I should be using a heavier buffer - like say an H2... correct?

    I have access to carbine and H buffers. But I'm wondering if shouldn't go ahead and buy the H2 for this, as I don't want to damage anything [since it's not really mine].

    If I run too light of a buffer things will slam around and could potentially amage something right? or is the only drawback higher recoil?

    I [I]think[I] I'm understanding this correctly, but once I got into port sizes I got somewhat confused.

    Any insight or clarity anyone can offer would be greatly appreciated~

  2. #2
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    I'd suspect that port to be somewhere in the .080'' range, and as high as .093'' from what I know.

    VLTOR A5 buffer system, Sprinco GREEN spring, and VLTOR's heaviest A5 buffer is the first thing I'd throw in it.
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    We miss you, ToddG.

  3. #3
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    Agreed with Magic.

    I'd also imagine a Tubbs flatwire CS action spring and an H3 buffer would help as well...at reduced cost from the A5 (with the A5/Springco Green being the ideal solution).

    If you're planning on keeping it, I'd invest in the A5 setup as described.
    Last edited by BufordTJustice; 10-06-11 at 00:22.

  4. #4
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    Using the H will not damage it. I would shoot it with that and see what it does.

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    I agree with 87GN. Shoot it and see what happens. It will not hurt the gun. Possible bolt bounce if it is full auto or extraction issues. May not "ejection pattern" exactly where you want. Recoil may be a little more harsh.

    I think it will run fine.

  6. #6
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    Quote Originally Posted by 87GN View Post
    Using the H will not damage it. I would shoot it with that and see what it does.
    Agreed. It may not lock back on empty here or there, but It'll probably run fine.

    H2 or H3 would probably be the quickest way to optimize function without switching the whole buffer system.
    "You people have too much time on your hands." - scottryan

  7. #7
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    With a Venessa del Rio port like that I would run an H2 or H3. I would be more concerned as to whether or not you will get reliable extraction if you use real 5.56 ammo since RRA is known to have made some tight chambers in the past.



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  8. #8
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    Quote Originally Posted by Iraqgunz View Post
    With a Venessa del Rio port like that I would run an H2 or H3. I would be more concerned as to whether or not you will get reliable extraction if you use real 5.56 ammo since RRA is known to have made some tight chambers in the past.
    Holy Shit I just spit some coffee out!

    Good one, Gunz.

    On a related note, Ned Christiansen 5.56 chamber reamer would be great insurance and a huge step toward reliability.

    Mike Pannone has observed that RRA's won't run very heavy buffers, even with full pressure NATO spec ammo. If the gas port on your 16" carbine-gas rifle is the size of Rosie O'Donnel's...um...gas port, and you can't run an H2 buffer with a std spring....your chamber is tight.

    Note: My lawyers would like me to add for clarification, Rosie O'Donnel does not have a tight chamber.

  9. #9
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    That is interesting about RRA/ heavier buffers. Not so much about Rosie....

    Quote Originally Posted by BufordTJustice View Post
    Holy Shit I just spit some coffee out!

    Good one, Gunz.

    On a related note, Ned Christiansen 5.56 chamber reamer would be great insurance and a huge step toward reliability.

    Mike Pannone has observed that RRA's won't run very heavy buffers, even with full pressure NATO spec ammo. If the gas port on your 16" carbine-gas rifle is the size of Rosie O'Donnel's...um...gas port, and you can't run an H2 buffer with a std spring....your chamber is tight.

    Note: My lawyers would like me to add for clarification, Rosie O'Donnel does not have a tight chamber.



    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

  10. #10
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    Hold on.... you're telling me gas port diameter matters?

    All this time reading M4C and The Chart, I thought it wasn't something we were supposed to worry our pretty heads over.
    Oh no, not another lube thread! Read this first: Lubrication 101.

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