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Thread: Rifle length gas line on 12.5" barrel???

  1. #1
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    Rifle length gas line on 12.5" barrel???

    I noticed that all of the 12.5" barrels that I have looked at all come with a carbine length gas system. Can you put a rifle length gas system on a 12.5" barrel? I have never done anything with a barrel that was shorter than 16".

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    Definitely not. There wouldn't be enough dwell time for it to get enough pressure to cycle the bolt. There were questions about whether mid-lengths would work on a 14.5 inch barrel before BCM worked out the kinks, so I can assure you that a rifle length won't work.

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    IIRC a rifle length gas system is ~12" long so I would say the answer to your question is no.
    Steve

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    What I am planning on doing is mounting a 12" free float handguard. Could I just leave the carbine length gas system if I use a 12" handguard. I only want to leave a half an inch because I want to use the Noveske kx3 flash suppressor and I want it to run right out of the handguards without being able to see any barrel.

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    Quote Originally Posted by SteveL View Post
    IIRC a rifle length gas system is ~12" long so I would say the answer to your question is no.
    So would I still be able to mount a 12" rail system?

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    Your rail doesn't care what length gas system you have unless you're using a FSB or gas block that would somehow interfere with the rail.

    https://www.m4carbine.net/showthread.php?t=47526
    "I have your number. Consider yourself warned."

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    Quote Originally Posted by Devildog0311 View Post
    So would I still be able to mount a 12" rail system?
    If your question is, can you mount a 12" rail on a 12.5" bbl carbine gas systme AR, then yes! you can. Of course you'll need a low pro gas block

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    Rifle gas system is 13.2 inches long.

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    Thank you guys, I am new to this build with a short barrel so sorry if I come off ill educated. Thats why I am here though. Problem solved.

  10. #10
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    Quote Originally Posted by ZRH View Post
    Rifle gas system is 13.2 inches long.
    Thanks for the clarification. I couldn't remember exactly.
    Steve

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