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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

    545
    0
    Sep 4, 2009
    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

    502
    3
    Aug 25, 1999
    Fort Collins, CO, USA
    I would recommend 10.5" or longer. Mine is 12"
     


  3. GiggleSmith

    GiggleSmith

    123
    243
    Sep 16, 2004
    East Coast
    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
  4. Hef

    Hef Stop Obammunism

    3,901
    25
    Sep 12, 2004
    Hilton Head, SC
    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.
     
  5. jmack37

    jmack37

    192
    1
    Nov 4, 2004
    SE Michigan
    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.
  6. tmc4065

    tmc4065

    2
    0
    Oct 5, 2015
    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:
     
  7. SmileForFlash

    SmileForFlash

    78
    16
    Dec 26, 2015
    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.