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Build advise

Discussion in 'AR Pattern Rifles' started by Pbj ak, Feb 13, 2020.

  1. Pbj ak

    Pbj ak B Supporting Member

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    So I’m looking to build a 20 inch rifle and have most of the parts but have a couple questions on a few things. Any advise is greatly appreciated. I’m looking to end up with an old school looking rifle with a basic handguard and buttstock.


    Here’s a picture of what I have now. The basics are

    aero upper (fde)
    Aero upper parts kit
    Faxon 20 inch gunner barrel
    Psa bcg
    M4e1 lower
    Carbine buffer assembly

    FF7FD411-F1D9-4DCB-A7AC-0ABC13AA72FC.jpeg



    What I think I need

    rifle length buffer assembly
    a2 F marked front sight post
    Basic rifle length plastic handguards
    A2 buttstock kit




    Question:

    Can I run a carbine buffer system with a barrel that has a rifle length gas system?

    Are all rifle length buffers the same?
     
  2. chrishf12

    chrishf12 Carolina Wanderer

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    You will also need a delta ring assembly and front handguard cap.

    Is the cut down FSP pinned or has it been modified to attach with set screws? Depending on if that barrel has been drilled for taper pins you may have to get a FSP that attaches differently.

    On the lower you will need a rifle length buffer tube and the rifle length buffer and spring components. They are different than the carbine ones.

    Oh, dont forget a charging handle! ;)
     
  3. Pbj ak

    Pbj ak B Supporting Member

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    @chrishf12

    I found the delta ring and cap. E50C5670-E86D-4E30-A07E-48CA02AB559B.jpeg

    I did overlook the charging handle so I’ll grab one soon. Until then I’ll rogue one from another upper.
    As for the fsp, it was a pinned standard fsp that has been ground off. I should be able to find one exactly like it and is the same , correct?

    image.jpg
     
  4. chrishf12

    chrishf12 Carolina Wanderer

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    Those taper pin holes are drilled in place with the FSP. They usually do not line up when swapping on a new FSP. I know some have drilled out the holes in the FSP and tapped for set screws. Or there are clamp on type FSP that will work.
     
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  5. Pbj ak

    Pbj ak B Supporting Member

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    Good looking out man just what I needed to know.
     
  6. WadeWatts

    WadeWatts Shameless Glock Fanboy

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    I’ve stuck my 20 inch upper on a carbine lower with the standard carbine buffer and it ran with no problems. But a rifle length buffer tube/extension needs a rifle spring and rifle buffer.
     
  7. Burt Gummer

    Burt Gummer Nuts Over Lil D. Staff Member Benefactor Charter Life Member Supporting Member

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