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FN Five-Seven KABOOM!

Discussion in '5.7 X 28mm Club' started by RustyShackelford, Feb 27, 2012.

  1. esh325

    esh325

    310
    0
    Sep 28, 2011
    I could do without the bigots.
     
  2. jmb79

    jmb79

    1,160
    0
    Sep 27, 2001
    Wyoming
    Well put esh325.
     

    Last edited: Jun 23, 2012

  3. NoJoy

    NoJoy

    517
    14
    May 4, 2005
    Seattle
    The production rounds run at 50,000psi (I believe), so when one blows up the plastic frame has to absorb the energy. I do like the round/gun combo though-very sweet and accurate shooter.
     
  4. Haldor

    Haldor Retired EE

    7,921
    974
    Oct 22, 2006
    Central Arizona
    That is an obvious case of significant overpressure, probably from a reloaded round. The Five/Seven is blowback and an overpressure round will cause the case to eject before the pressure has dropped to a safe level, resulting in a ruptured case. For a Five/Seven to fire this far out of battery would require deliberate modification to the pistol.

    The 5.7x28 round is very high pressure (>50k), and there is very little margin for error in reloading it. The guy who experienced the KBoom admitted he was shooting 5.7 reloads earlier in the day, but he is claiming this particular round that blew up was not a reload. This is a doubtful claim.
     
    Last edited: Aug 25, 2013
  5. bingoke

    bingoke

    23
    0
    Aug 6, 2012
    Belgium
    To DrtyHarry and Banjobob:

    I live in Belgium and we can own every firearm we want, EXCEPT the 5.7x28mm.
    In my vault are Rugers (GP100, SR1911, MKII an III...),
    Glocks (19, 21 ), Berettas (92FS, Cougar...) and a dozen other fine handguns in mutiple calibers.
    The only restriction is the FiveseveN.
    This caliber is not allowed for civilian use.
    So when DrtyHarry wants to come over: welcome, but leave the
    5.7x28mm at home!
    Stay safe bro!
     
  6. kilibreaux

    kilibreaux

    201
    1
    Oct 12, 2013
    Sadly, a LOCKED-BREECH during the moment of firing is so much more secure than a blow-back action attempting to contain nearly 40K psi.
    The 5.7 uses a certain type of delayed blow-back action but there is no actual mechanical interface that holds the slide closed during the high-pressure phase.
    The 5.7 pistol uses a delay system, but it's not a LOCK system.
     
  7. ca survivor

    ca survivor

    8,435
    57
    Dec 25, 2011
    Florida
    yep, that will required a under wear change for sure.
     
  8. ca survivor

    ca survivor

    8,435
    57
    Dec 25, 2011
    Florida
    Quote:
    Originally Posted by ca survivor [​IMG]
    lately I'm moving more and more away from plastic frames
    [​IMG] looks like there was no injury to the hand on the METAL/STEEL gun
     
  9. mcordell

    mcordell

    9
    0
    Sep 19, 2012
    Love this round but afraid to reload for it
     
  10. TheDoubleJ

    TheDoubleJ

    16
    0
    Nov 9, 2015
    Front Range
    Interesting how the barrel never fails when a 57 goes KB. I reload for mine, very carefully, and never hotroddy. I just like to keep the price down, even worked up a cast load for it. It's also very easy to quiet down with a good can, even the fast stuff is tolerable.