Buffer Q.

Discussion in 'AR-15 Discussion' started by jcooley6960, Jul 27, 2012.

  1. jcooley6960

    jcooley6960 New Member

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    Does the length of the gas system (rifle,mid,carbine) have anything to do with what buffer weight or spring you use in the buffer tube?
     
  2. mountainman13

    mountainman13 New Member

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    Welcome to FTF. One of our AR experts should be by shortly.
     

  3. Quentin

    Quentin New Member

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    The way you worded the question the answer has to be yes. Why not elaborate?
     
  4. jjfuller1

    jjfuller1 New Member

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    Style yes. A rifle gas system should use a rifle stock and buffer. Mid and carbine should use carbine stock and buffer. It's possible but not advisable to interchange them. As far ad weight that's more of your call. Personally I use a heavy buffer. It reduces what little recoil there is and I just like it.
     
  5. AgentTikki

    AgentTikki New Member

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    Yes.

    Rifle gas systems usually are paired with rifle buffer assemblies.

    Middy and Carbine gas systems use carbine buffer assemblies.

    Rifle buffers are longer and heavier than a standard carbine buffer.
    Rifle tubes (aka receiver extensions) are longer than carbine counterparts.
    Rifle springs are longer and have different spring rates than a carbine spring.

    There are other buffer assemblies aka pistol length systems and Vltor's A5 system.

    General rule of thumb, use a rifle buffer assembly with a rifle gas setup, and carbine with carbine gas systems. You can mix and match setups but be careful.
     
  6. AgentTikki

    AgentTikki New Member

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    Just don't go mixing components within your buffer tube assemblies with one another and you should be fine.
     
  7. Vikingdad

    Vikingdad New Member

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    So what does this mean? I have a bunch of different buffer springs and a few weights but I can't mix and match? Is there a chart that gives some guidelines or something?

    This is a serious question. I am also worried about if I put a rifle length upper (20-inch) on my carbine lower (I have a 16 inch upper now) will it cause damage and/or injury?

    I don't mean to hijack the thread but i am new to this as well.
     
  8. AgentTikki

    AgentTikki New Member

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    Don't mix up rifle buffer components with carbine buffer components.

    Ie don't put a rifle buffer or sprng into a carbine buffer tube.

    Ie don't put a carbine buffer or spring into a rifle tube.
     
  9. treehugger49

    treehugger49 New Member

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    All of the above, and I think the general rule as far as buffer weight goes; use the heaviest buffer your particular gun will reliably cycle with the lowest powered ammunition you plan on using.

    ....and welcome to the forum!
     
    Last edited: Jul 28, 2012
  10. fsted2a

    fsted2a Active Member

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    The reason the posts are telling you not to get your buffer/tube/spring assembly mixed up is the BCG (bolt carrier group) has to travel the same distance, regardless of what assembly you have behind it (I beleive it is 3 or 4 inches). If you have a rifle buffer tube, with a carbine buffer, at some point the BCG will get jammed half in the tube and half in the receiver, and it will be a mother****er to get out. If you have a carbine buffer with a rifle buffer tube, you can either have a short stroke problem or a slam fire, which is bad juju with the ATF, and/or may cause a catastrophic failure of the firearm. I believe there are also other bad things that can happen if you mix and match buffer components. You can put a carbine buttstock or a rifle buttstock ASSEMBLY on any AR, just don't mix and match components of the assemblies.
     
  11. purehavoc

    purehavoc New Member

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    Well while were on buffer weights :D when you go suppressed will you need a heavier buffer with the added gas pressure ? If so how much more weight H2, H3 ?
     
  12. Quentin

    Quentin New Member

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    I'd say H3 in a standard length carbine tube or the Vltor A5 EMOD kit.
    http://www.vltor.com/emod.htm
     
  13. purehavoc

    purehavoc New Member

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    Thats what I figured , anyone know the correct weights for each one ? I have a couple extra buffers and I wouldnt mind messing around with the melting pot and replacing some with lead weights and see how they run in the standard carbine . This wont be suppressed so i wont need to get up in the H2 or H3 weights but it would be good to know the differences for future reference
     
  14. purehavoc

    purehavoc New Member

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    I know carbine is 2.9 oz on the carbine, H buffer is 3.77 oz . rifle / SP1, SP2 5.15 oz

    Found them ,H2 4.6 oz and H3 5.4 and HSS 6.5 oz

    I recently received a odd buffer from palmetto that wasnt black, it didnt have any markings on the face , it was silver but did weigh the same as all my carbine buffers , figured it would be a good one to paly around with and see how much difference it makes a gun
     
    Last edited: Aug 1, 2012
  15. Quentin

    Quentin New Member

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    Yeah I usually start with 2.9 oz for the standard weight carbine buffer then incrementally add 0.9 oz to get H, H2 and H3. Or simplify and go 3 oz, then add 1 oz over and over.

    Wonder if the oddball buffer has separate weights or just filled with powder?
     
  16. fsted2a

    fsted2a Active Member

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    There is another alternative to think about: an adjustable gas block. That way, you can adjust for silencers or different brands of ammo. I would think someone who has enough to spend on the silencer would want one anyway.
     
  17. Gatoragn

    Gatoragn Active Member

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    I assembled a lower with rifle stock on which to run my 6.8 spc carbine upper. I traded out the rifle buffer for an H carbine and it works just fine. Hopefully a deer will cooperate this season and walk in front of my 6.8.