Ar-15

Discussion in 'AR-15 Discussion' started by rando, Mar 21, 2013.

  1. rando

    rando New Member

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    Can a 762x39 fire a 556 round?
     
  2. kryptar19

    kryptar19 New Member

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    In a word....NO

    and in two words...HELL NO

    plz DO NOT try it, something catastrophic could happen.
    At the very least you would have a live 5.56 round stuck in your 7.62x39 barrel.

    This will not auger well for you.
     

  3. chrishiggin29

    chrishiggin29 Member

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    No 7.62x39 is 30 caliber. 5.56 is 22 caliber + the cases are different sizes
     
  4. SSGN_Doc

    SSGN_Doc Well-Known Member

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    Understand that the chamber of any centerfire rifle that uses a bottle necked cartridge is cut to dimensions meant for an individual chambering only. the chamber has to provide support for the brass cartridge at all points to keep the brass from bursting when the cartridge is fired.

    Also the bore must make contact with the bullet to send it in the right direction and keep the projectile from skipping down the bore and doing damage to it. Or if the bore was too tight it could cause severe overpressure that would actually cause the barrel to burst.
     
  5. SSGN_Doc

    SSGN_Doc Well-Known Member

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    Now if you bought a AR15 chambered in 7.62x39 and bought a 5.56 upper half, then you could shoot 5.56 when that upper was installed, and 7.62x39 when that upper was installed.
     
  6. c3shooter

    c3shooter Administrator Staff Member

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    No. Below are (left to right) a 7.62x39, a Russian 5.45x39, and a 5.56x45. The second set of numbers is the case length in mm.

    AssaultRifleCalibers.jpg
     
  7. nchunt101

    nchunt101 New Member

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    Just an FYI -- most if not all modern firearms have what they are chambered for on the barrel. ONLY USE THE CALIBER THE FIREARM WAS DESIGNED FOR
     
  8. rando

    rando New Member

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    K thanks I don't know why someone at cabelas would say that but I kinda thought it was B.S.
     
  9. ScottA

    ScottA FAA licensed bugsmasher Lifetime Supporter

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    Even the best organizations will have a couple fruit loops.