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best length SBR barrel for 5.56?

Discussion in 'GATE NFA/Class III' started by IQof1, Sep 27, 2012.

  1. IQof1

    IQof1

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    thinking of building an SBR upper in 5.56 and was very curious as to the best barrel length for this project and why it is so.

    i have read that the 7" barrels will knock your fillings loose so i was kind of leaning towards the 10" barrel.

    thnx in advance!
     
  2. Zak Smith

    Zak Smith 3Gunner Millennium Member

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    I would recommend 10.5" or longer. Mine is 12"
     

  3. Scott3670

    Scott3670

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    My 556 barrel is 11.5 inches.
     
  4. GiggleSmith

    GiggleSmith

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    I have two Uppers:
    11½ and 20 inches.

    I've contemplated on buying a 4 Inch Upper at a Fun Show I once saw, and 24 AND 26 inch Uppers I've found in catalogs. But so far I've been perfectly happy with both so I never bothered to buy another Upper.

    The shorty's are perfect for SBR matches, the longer ones for CMP/DCM shoots.
     
    Last edited: Oct 6, 2015
  5. Hef

    Hef Stop Obammunism

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    I have a 10.5" upper on mine. From what I have read, 11.5" is the shortest barrel to get to maintain sufficient muzzle velocity for stability in flight and energy on target, though I haven't tested that myself.
     
  6. jmack37

    jmack37

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    The mission should always drive the gear.

    I know 10.5" AR uppers can run reliably, but I've seen plenty of problems at that length that don't crop up with 11.5" uppers. 11.5" is my sweet spot for a compact gun that is reliable and maintains adequate ballistics.
     
    Hef likes this.
  7. tmc4065

    tmc4065

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    From a silencer standpoint, few if any manufacturers warranty a can for less than 10.5" in 5.56. I personally wouldn't go less than that unless you want a hand cannon to piss other people off with at the range :50cal:
     
  8. SmileForFlash

    SmileForFlash

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    I own a couple and have always read anything under 11.5 reduces reliability when shooting without a suppressor. I would keep this in mind when purchasing your uppers.