CAR stock with a 20" barrel?

Discussion in 'AR15/10 Rifles' started by shortgrass, Jan 11, 2020.


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  1. shortgrass

    shortgrass Well-Known Member

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    I'm not a AR guy by any stretch. Can the std CAR stock, spring and buffer be used with a 20" barrel? Or, is there a need for a 'heavy' buffer?
     
  2. Ckgworks

    Ckgworks Well-Known Member

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    I have run a 20" like that and it worked fine. If it cycles hard you can always use an adjustable gas block.
    Edit to add: you can also buy "heavy CAR buffers if you need......mine runs fine with the standard, but if you gas port is oversized, you may need it.
     
    Last edited: Jan 11, 2020
  3. cohunt

    cohunt Well-Known Member

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    Gas length does not need to equal stock length.

    You can run rifle, mid, carbine, pistol, or specialty gas length just make sure you buy the correct gas tube.

    The stock/buffer tube length is totally separate but one again needs to be paired with the correct/same buffer and spring

    So a carbine length tube, spring, and buffer

    Or rifle tube, spring, and buffer

    Carbine buffers have quite a few weights - std, h2, and h3, there are also specialty weight carbine buffers (ultralight/1oz and h4 also)

    There are also heavier weight springs too

    My suggestion is use a carbine tube, spring, and std weight carbine buffer with what ever length gas system your 20" barrel has (normal for a 20" barrel is rifle length gas)

    If it's over gassed then buy an adjustable gas block and cut down the gas a bit
     
  4. shortgrass

    shortgrass Well-Known Member

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    Thanks for the insights.....
     
  5. cohunt

    cohunt Well-Known Member

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    It can get a little confusing-- especially if you start getting into the specialty weight buffers, springs and proprietary length gas systems
     
  6. Daves762

    Daves762 Well-Known Member

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    I have to wear lots of clothes half the year due to temperatures. I find that fixed length stocks don't work for me. I run carbine buffer tube, spring, buffer on rifle length gas systems, and it works fine. For mid length and carbine length systems I use the H2 heavy buffer with standard spring weight. I no longer have fixed length stocks on any AR platform.
    AR15 dot com is where all the AR nerds hang out and preach their infinite wisdom. If you have a question about AR stuff, you will have no shortage of "expertise" asking it there. When it comes to ammo testing check out MOLON's posts. That guy posts some wisdom, with pictures to prove it.
     
  7. shortgrass

    shortgrass Well-Known Member

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    I am not building 1 (or 2). I have very little interest in AR rifles or handguns. Had a client ask me about using a 20" barrel w/rifle length gas on a CAR stock. It just peaked my interest, is all...
     
  8. Kansaswoodguy

    Kansaswoodguy Well-Known Member

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    I have at least three 20" with carbine stocks no worries
     
  9. Scrounger

    Scrounger New Member

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    Ran a 204 20" with a carbine stock. Actually had to pull weights out of the buffer to get it to cycle, but it did work.