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300 blackout in a 223 kaboom. (Pics inside)

Discussion in 'Rifle Country' started by beeenbag, Nov 8, 2018.

  1. beeenbag
    • Contributing Member

    beeenbag Member

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    so a friend of mine came up for me to swap out the FCG in his AR for him. While I’m working at the bench, he’s looking around the gun room. In the process he manages to grab one of my loaded pmags of 300 blk and is walking around with it. I get his firearm done and tell him we can step out to the range here at my house to try it out. He mistakenly grabs the pmag he’d been walking around with instead of his off brand mag full of 223.

    Of course I never know he’s even touched a mag full of 300, muchless that he had one in his pocket. He sits down at the bench, inserts mag, chambers a round, no problems at all up to this point.

    I’m standing behind him watching the target when kaboom, and smoke rolls from around him and his gun. I immediately knew something was wrong without even seeing the firearm. Once we pulled the mag out I explained to him what had happened (in a cuss your friend for being a dummy kind of way) as soon as I seen what had happened. Very lucky there were zero injuries. We had a little lesson session following this. Here are some pics.

    05961E2D-5E99-413D-A2A1-750EF60C67D5.jpeg BC869984-617F-4FAE-B7FF-0D065D96702B.jpeg C3BC58E1-AD16-4613-A015-190158C1A5FF.jpeg 1CCE4823-825E-4D99-9B76-E3DBC8EB5C41.jpeg
     
    horsey300, ilgac, Odd Job and 5 others like this.
  2. boom boom
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    boom boom Contributing Member

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    I'm impressed that the polymer lower held together as well as it did. It could have been much worse.
     
    hdwhit, horsey300, SamT1 and 4 others like this.
  3. beeenbag
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    beeenbag Member

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    The lower is trashed as well. See the bottom pic.
     
    shootstraight57 likes this.
  4. <*(((><
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    <*(((>< Contributing Member

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    Ouch, he's lucky especially considering it's a polymer upper, could've been much worse.

    The downside to AR15 calibers with a 223/5.56 case head and different caliber bullets. Diligence is required.
     
    Last edited: Nov 8, 2018
  5. Hokie_PhD

    Hokie_PhD Member

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    Wow
    I’m glad you’re both ok

    This is a great reminder to make 300 Blackout (and other calibers) clearly marked and away from prying hands. And all hands don’t have to be kids.

    It’s also a good reason to have mags a color that are easy to see as other calibers (as a final sanity check)
     
    JeffG, Glockula and Gordon like this.
  6. beeenbag
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    beeenbag Member

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    Yeah I think the simplest solution is for me to adopt a “no loaded 300 blackout mags” policy since I don’t want to mark and label a bunch of mags. I have 4 chamberings in ARs so I have a very diligent routine for checking any loaded mags and one chambering at a time allowed out at the range.
     
    hq, Hokie_PhD and Gordon like this.
  7. Olon

    Olon Member

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    Man, that's some carnage. Glad nobody is physically hurt though I'm sure your buddy is critically injured in the pride and fiscal departments.
     
    Bfh_auto likes this.
  8. boom boom
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    boom boom Contributing Member

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    Yeah but it doesn't look to have fragmented badly. That is what I meant as a lot of kabooms energy is often directed down the magwell.
     
    Olon likes this.
  9. md7

    md7 Member

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    I’m glad everyone is ok. I’ve seen this type thing happen enough that if I ever get a 300BO it’s going to get a rattle can job of some unique, off the wall color and so will each designated mag that is used to feed it.

    And I will store them away from my 5.56 rifles, mags, and ammo.

    Yikes!
     
  10. beeenbag
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    beeenbag Member

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    Yeah I was pretty surprised that it didnt blow apart myself. The upper is just chunks. I’m in the process of tearing it down now to see what parts I can salvage to build him another one. So far the only thing usable from the upper is the charging handle and forward assist. Lower parts seem to be in good shape.

    7A9A73C1-4A06-442D-9969-51DAE7D33ADC.jpeg BC1500CB-8B32-46DE-B204-949407C6CD52.jpeg D6C74EED-0D20-4083-BDDD-915F9D023259.jpeg
     
    ilgac and boom boom like this.
  11. boom boom
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    boom boom Contributing Member

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    Thanks for posting these as a caution to others.
     
    303 hunter likes this.
  12. 303 hunter

    303 hunter Member

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    I’ve never seen a bolt carrier destroyed like that. Glad he’s ok.
     
    beeenbag likes this.
  13. Sistema1927

    Sistema1927 Member

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    The reason why my 300 AAC Blackout pistol has a band marking the magwell with all of the mags that I use also similarly banded.
     
  14. Legionnaire
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    Legionnaire Member

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    So a .300 BLK is short enough to fit in a .223 chamber? I had assumed it would be too big to fit ...

    Maybe the bullet gets pushed back into the case?
     
    Driftertank and JeffG like this.
  15. jmorris

    jmorris Member

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    Think about it, they are both loaded to an OAL that will fit in an AR mag and you chop the .223 case shorter.

    Looks like this.

    C8FF5592-8A36-406D-837B-B574CD25BE5A.jpeg

    At least before you try and push a .308 down a .223 bore.

    I’ve seen folks (me too) do a lot of “dumb” stuff when all they really needed to do is pay attention.
     
  16. beeenbag
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    beeenbag Member

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    Here you go

    F9647544-23AE-41AE-BB5C-2A9EC5B71B05.jpeg


    edit... beat me to it, and what are the odds we’d post the same picture?
     
  17. jmorris

    jmorris Member

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    First one that comes up on an image search.
     
  18. Legionnaire
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    Legionnaire Member

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    Interesting. Always learning.

    Glad no one was hurt!
     
  19. Englishmn
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    Englishmn Member

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    I think that scope mount afforded some protection.
    Seen several 300blk in .223 kaboom videos always destroy rifle but minimal to no injury. That .308 bullet gets pretty long as it gets squeezed down.

    Be paranoid and check whats in the mag twice.
     
    Hokie_PhD likes this.
  20. MEHavey

    MEHavey Member

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    Thank you Gene Stoner ... . .
     
    DannyLandrum likes this.
  21. tarosean

    tarosean Member

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    Im more interested to learn where the Bolt was from.
     
  22. Captains1911

    Captains1911 Member

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    The reason why I only load 300 BLK into dedicated mags banded with red tape.
     
    Chuck R. likes this.
  23. beeenbag
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    beeenbag Member

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    Bolt said m&p on it. No markings that could tell on the carrier.
     
  24. FL-NC

    FL-NC Member

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    If I had a AR in 300 B-O I would do what my friend did- he had the upper laser etched 300 B-O in huge font on both sides of the upper, and he only uses Lancer clear mags stenciled 300 with that gun. He loads the mags at home and places the loaded mags in the case with that caliber gun. When he has 223 and 300 AR's at the range at the same time, only 1 case at a time is ever opened. I would be equally paranoid about such a screw up.
     
  25. Bill Raby

    Bill Raby Member

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