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Thread: What is the shortest bbl for an AR15?

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    Gunco Member Patrick/GSA's Avatar
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    Default What is the shortest bbl for an AR15?

    I was seeing these great looking AK74 pistols with, 3 to 4" bbls. What about an AR15? I know you would have to mod the gas set up. But, what the hell!
    Maybe, 4 to 5"?


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    Gunco Addicted for life j427x's Avatar
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    generally about 7" for 5.56/223 though 4th is working on a AR-15 derringer in 5.56--LOL!

    no limitation for pistol rounds in blow-back.


    the deal with pistol cals running DI is there about the same length as a pistol barrel and i am thinking shorter would be better on the gas block with them.

    now here is an idea for super short 5.56 like a 5"-- --go with a gas piston set up!

    even the cheap gas piston kit has an adjustable gas block that could come in very handy--

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    Gunco Member Patrick/GSA's Avatar
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    Hell yeah! Thank you that's what I was thinking! cut down a piston operating rod to fit. I was thinking about doing that. Make the gas port hole bigger, than have an adjustable gas block. Use the gas it needs and, vent the rest. Thanks again for the tip and, info j427x

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    Gunco Addicted for life j427x's Avatar
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    Quote Originally Posted by Patrick/GSA View Post
    Hell yeah! Thank you that's what I was thinking! cut down a piston operating rod to fit. I was thinking about doing that. Make the gas port hole bigger, than have an adjustable gas block. Use the gas it needs and, vent the rest. Thanks again for the tip and, info j427x

    did i mention that CDNN has the pistol version on sale for $130 ish?

    copes sells the rifle/carbine versions of the piston set up for about $166---IIRC

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    Gunco Member Patrick/GSA's Avatar
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    yes..I was going to get a piston kit from cdnn

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    Gunco Member Patrick/GSA's Avatar
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    Gunco Addicted for life j427x's Avatar
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    Quote Originally Posted by Patrick/GSA View Post

    6.5" is awful close to 7"-- you will probably have to cut and drill your own to get much shorter than 6.5"

    a 4.5" barrel would be about 1/2 chamber with 5.56--

    a 300BO would be better--in such a shot barreled pistol. if it was to have any useful purpose.

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    Gunco Member Patrick/GSA's Avatar
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    true! I was thinking about maybe both 556 and, 300...thank you for all the great info!

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    Gunco Addicted for life j427x's Avatar
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    it might be possible to go "super-short" with the DI set up. that would require at least an adjustable gas block and more that likely some bolt carrier mods.

    this path would likely be as expensive as the piston system and more fussy.

    pistol cal conversions seem to be a natural for shorties running DI.

    i been wanting to build a 45 super DI/gas pistol for some time now. mad-machinist makes all the stuff needed.

    money is tight and other projects keep getting in the way. one day i am going to build a DI pistol in either 45 super of 357 sig.

    357sig would be easy cause the 9mm mags and blocks will work--LOL

    and a 357 sig would be mucho powerful--LOL

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    3/6 Infantry mtdew's Avatar
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    Good Lord!
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