Pennsylvania Firearm Owners Association
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  1. #1
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    Default BBL. length question

    I am going to SBR (legally) an AR in 5.56. Upper has a mid length gas tube. How short, past the gas block, can the barrel be and still function ? Anyone with experience on this? Most of the AR pistols I have seen either have a carbine length gas tube or a pistol length. Depends on how short the barrel is.
    JC Blauvelt Gunsmith,Inc. JCBgunsmith.com

  2. #2
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    Default Re: BBL. length question

    A mid length gas system is tuned to a 16 inch barrel. You could go to a 14 inch barrel without noticing anything but much shorter starts to get iffy. You need enough time after the bullet passes the port to get the bolt moving. I am sure you could eventually get a shorter barrel to work with different buffers or an adjustable gas block but my question is why? Just buy a pistol or carbine barrel with components that have been proven to work. They are not expensive and will save you a lot of aggravation.

  3. #3
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    Default Re: BBL. length question

    Thank you for the reply. Problem is that barrels are in short supply. The reason I am asking for info on how short I can go with the existing barrel.
    JC Blauvelt Gunsmith,Inc. JCBgunsmith.com

  4. #4
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    Upper Bucks, Pennsylvania
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    Default Re: BBL. length question

    https://www.armorally.com/shop/faxon...gunner-barrel/

    This is a mid length gas port in a 11.5"

  5. #5
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    Jan 2007
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    Default Re: BBL. length question

    Quote Originally Posted by JC Blauvelt View Post
    Thank you for the reply. Problem is that barrels are in short supply. The reason I am asking for info on how short I can go with the existing barrel.
    For me, going from a 16" to 14" isn't worth the time it takes to fill out a Form 1 let alone a two hundred-dollar tax. If you are going to go short, then go short.

  6. #6
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    Feb 2013
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    The cold, dark, void, Pennsylvania
    (Clearfield County)
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    Default Re: BBL. length question

    Keep in mind even with a 10" barrel the OAL of an SBR AR is about the same as a Tavor.

  7. #7
    Join Date
    Aug 2010
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    Yardley, Pennsylvania
    (Bucks County)
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    Default Re: BBL. length question

    I have a 11.5" Faxon gunner barrel awaiting install. Midlength gas. Should be interesting. Going to run a Superlative Arms adjustable gas block, and JP captured buffer spring. Eventually suppressed.

    Back on topic, the faxon gunner, 11.5", with midlength gas is a proven setup, granted everything else falls in place.

    So, theres a ton of variables to account for, lmao
    Mostly browsing these days, and expanding the collection.

  8. #8
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    Belly of the BEAST, Pennsylvania
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    Default Re: BBL. length question

    Quote Originally Posted by raxar View Post
    Keep in mind even with a 10" barrel the OAL of an SBR AR is about the same as a Tavor.
    Never really seen it as worth the stamp unless it was a buffer-less piston setup.

  9. #9
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    Default Re: BBL. length question

    Quote Originally Posted by Duece McCracken View Post
    I have a 11.5" Faxon gunner barrel awaiting install. Midlength gas. Should be interesting. Going to run a Superlative Arms adjustable gas block, and JP captured buffer spring. Eventually suppressed.

    Back on topic, the faxon gunner, 11.5", with midlength gas is a proven setup, granted everything else falls in place.

    So, theres a ton of variables to account for, lmao
    So let us know how it works out . AFAIK the Faxon mid length barrels are made to run suppressed. There is not enough dwell time with out a suppressor to get it to run without an adjustable gas block and some tweaks (and a thousand dollars worth of ammo to make sure the teaks run).

  10. #10
    Join Date
    Aug 2014
    Location
    Pittsburgh, Pennsylvania
    (Allegheny County)
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    Default Re: BBL. length question

    The Faxon barrel (I have one) has a huge gas port, so it'll run unsuppressed.

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