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Thread: midlength buffer?

  1. #21
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    Quote Originally Posted by Terminator2003 View Post
    Just waiting for the rest of my parts to arrive, so I figured I would ask for some opinions on whether the buffer with be fine with my new build. I have a 14.5" lightweight middy upper (BCM), and since I have a stripped lower (Spikes), I ordered the MOE complete lower build kit from PSA, which includes the milspec carbine buffer tube, spring, and (I think) "H" buffer. Will this upper function properly with the "H", or should I order a heavier weight buffer for it?
    The BCM Midlengths (14.5" and 16") is designed to work with CAR or H buffers.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  2. #22
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    Quote Originally Posted by Robb Jensen View Post
    The BCM Midlengths (14.5" and 16") is designed to work with CAR or H buffers.
    That is good to know, thanks! Looks like I may be fine after all. I guess the buffer weight only becomes a big issue with certain types of ammo, so hopefully I will get lucky since most of my shooting will be with 55 grain target ammo, and maybe some m855 to see how that runs.

  3. #23
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    Quote Originally Posted by Terminator2003 View Post
    That is good to know, thanks! Looks like I may be fine after all. I guess the buffer weight only becomes a big issue with certain types of ammo, so hopefully I will get lucky since most of my shooting will be with 55 grain target ammo, and maybe some m855 to see how that runs.
    If it doesn't run on .223Rem pressure ammo it's not a gun problem, the BCM is chambered in 5.56mm NATO.
    Just like a Toyota FJ cruiser is designed for 92/93 octane gas per the owners manual. It doesn't run well on 87 octane because it wasn't designed that way. The non-Milspec ARs with large non-Milspec size gas ports are for those guys that want to use .223Rem and 5.56mm NATO pressure ammo. This is fine if you'll only shoot a small amount of 5.56mm NATO ammo. There's no free lunch. NATO pressure ammo through a large gas port causes more problems than shooting it through its proper sized gas port.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  4. #24
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    Quote Originally Posted by Robb Jensen View Post
    If it doesn't run on .223Rem pressure ammo it's not a gun problem, the BCM is chambered in 5.56mm NATO.
    Just like a Toyota FJ cruiser is designed for 92/93 octane gas per the owners manual. It doesn't run well on 87 octane because it wasn't designed that way. The non-Milspec ARs with large non-Milspec size gas ports are for those guys that want to use .223Rem and 5.56mm NATO pressure ammo. This is fine if you'll only shoot a small amount of 5.56mm NATO ammo. There's no free lunch. NATO pressure ammo through a large gas port causes more problems than shooting it through its proper sized gas port.
    Great post Robb! Sanity!

  5. #25
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    Quote Originally Posted by Robb Jensen View Post
    If it doesn't run on .223Rem pressure ammo it's not a gun problem, the BCM is chambered in 5.56mm NATO.
    Just like a Toyota FJ cruiser is designed for 92/93 octane gas per the owners manual. It doesn't run well on 87 octane because it wasn't designed that way. The non-Milspec ARs with large non-Milspec size gas ports are for those guys that want to use .223Rem and 5.56mm NATO pressure ammo. This is fine if you'll only shoot a small amount of 5.56mm NATO ammo. There's no free lunch. NATO pressure ammo through a large gas port causes more problems than shooting it through its proper sized gas port.
    So, are you suggesting that I may have issues running the lower pressure .223 ammo because my BCM is chambered for the 5.56? And if that's the case wouldn't running a buffer weight (either higher or lower depending on the situation) help to mitigate that? In my example where I already have the milspec BCM setup, and will likely be using a lot of .223 target ammo with it, are you suggesting that the standard carbine buffer will be under-weighted to cycle properly? I thought I was all set until your post, which now leaves me with more questions/concerns. I should be receiving the parts this week sometime according to PSA, so it won't be for at least another week before I will even get a chance to test anything.

  6. #26
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    No your carbine buffer is "better" than a heavier one in that case.

    He was just getting more in depth, which for some people is not always best. You are "all set" assuming you have someone else to assemble your gun for you.

  7. #27
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    Quote Originally Posted by nml View Post
    No your carbine buffer is "better" than a heavier one in that case.

    He was just getting more in depth, which for some people is not always best. You are "all set" assuming you have someone else to assemble your gun for you.
    What no faith. We all did it a first time.

  8. #28
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    Quote Originally Posted by nml View Post
    No your carbine buffer is "better" than a heavier one in that case.

    He was just getting more in depth, which for some people is not always best. You are "all set" assuming you have someone else to assemble your gun for you.
    Ok, thanks. I just don't have a large amount of experience in using different buffer weights, and any of the ARs that I have used have all been carbine length gas. This is my first build, and it happens to be midlength, so I want to make sure I get all of the right components for it. Assembling it is not an issue, as I have spent most of my career as a machine designer/prototype machinist, so I know a thing or two about how mechanical things go together. My background does make me over think things sometimes, though, which is why I asked more questions after that "more in depth" post. I'm always eager to learn more, though, so it wasn't necessarily a bad thing.

  9. #29
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    Quote Originally Posted by BUBBAGUNS View Post
    What no faith. We all did it a first time.
    Thanks. I'm just trying to learn all I can about this platform, the assembly part is pretty basic stuff by comparison.

  10. #30
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    Quote Originally Posted by BUBBAGUNS View Post
    What no faith. We all did it a first time.
    Thanks. I'm just trying to learn all I can about this platform, the assembly part is pretty basic stuff by comparison.

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