best length SBR barrel for 5.56?

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

  1. 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!
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  3. Zak Smith

    Zak Smith 3Gunner
    Millennium Member

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

  4. My 556 barrel is 11.5 inches.
  5. 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 fond 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.
  6. Hef

    Hef Stop Obammunism

    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.

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