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What the heck did I buy? AR-15

Discussion in 'Rifle Country' started by floorit76, Jun 29, 2012.

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  1. floorit76

    floorit76 Member

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    Bought an AR off Gunbroker earlier this week. Lower is marked Rock River, but I can find no marks at all on the upper. It was sold from a pawn shop, as a 5.56mm. Tonight I decided to try it out. Steel case wouldn't go into battery, so I tried a brass case and it did. I ejected the round and found that it had developed an extra shoulder. (Shown in pic, beside normal round) Upon inspection, the bore looks slightly larger than a 5.56, and 223 ammo fits high and loose in the chamber? 6.5? 7.62? Where would I find a mark? I haven't removed the quad rail, but I did look in the slots with a light and saw no markings anywhere on the barrel. ????????????????? :what:

    [​IMG]
     
  2. Twmaster

    Twmaster Member

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    Look on the bottom of the barrel. You may need to remove the hand guard.

    Also, check the magazine. It might tell you.

    Failing that it might be time for a trip to the gunsmith for him to cast the chamber.
     
  3. gunnysmith

    gunnysmith Member

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    It should be under the quad rail just in front of the barrel extension, left side.

    URL to the auction it mat have a clue
     
  4. Wicked

    Wicked Member

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    Very interested in the results of this one. Gunsmith would probably be your best bet.
     
  5. meanmrmustard

    meanmrmustard Member

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    Thank the lord you didn't pull the trigger.
     
  6. LJ-MosinFreak-Buck

    LJ-MosinFreak-Buck Member

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    I'm wondering if it's not one chambered in 5.45x39... Seems like the extra shoulder is because the chamber pushed it back.
     
  7. meanmrmustard

    meanmrmustard Member

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    You know, that's a good thought.

    Op, do you have a pic of the magazine?
     
  8. floorit76

    floorit76 Member

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    Mag only reads C products LLC Newington Ct. Removing handguard will have to wait till I get home later.
     
  9. rcmodel

    rcmodel Member in memoriam

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    If it was a 5.45mm Russian, the bore would be smaller, not larger then a .223 and you would have rifling marks on the bullet.

    [​IMG]

    Plus, the case on a 5.45mm is shorter to the shoulder then a .223.
    If the bore is smaller then a .223, then it probably is a 5.45x39.

    Good luck with that.

    rc
     
  10. TurtlePhish

    TurtlePhish Member

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    If the bore is larger than .223, it ain't a 5.45. Plus the shoulder of 5.45x39 is WAY farther back than that in comparison to a 5.56/.223.

    ETA: rc beat me by seconds....
     
  11. LJ-MosinFreak-Buck

    LJ-MosinFreak-Buck Member

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    But isn't the case on the .223 longer than the 5.45? That's what that bulge looks like, like it was pushed in and squished, and like the ogive was too big, and pushed in from there.
     
  12. TurtlePhish

    TurtlePhish Member

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    It is longer, but close to the same width. I'll post a pic of the cases next to each other in a minute.

    Edit:
    [​IMG]
     
  13. floorit76

    floorit76 Member

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    Measuring with the calibrated eyeball, the bore looks slightly larger than my 223, but smaller than my 7.62.
     
  14. LJ-MosinFreak-Buck

    LJ-MosinFreak-Buck Member

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    Well if it's larger, then I don't know. And I'm not even sure what would case the shoulder to look like that if it was loose in the chamber.
     
    Last edited: Jun 29, 2012
  15. TurtlePhish

    TurtlePhish Member

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    Maybe 6.8SPC?
     
  16. meanmrmustard

    meanmrmustard Member

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    True. Could it be that the upper is 300 AAC?
     
  17. TurtlePhish

    TurtlePhish Member

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    If the bore is smaller than 7.62, it's not .300BLK.
     
  18. animator

    animator Member

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    I'd be willing to bet 6.8
     
  19. meanmrmustard

    meanmrmustard Member

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    .243?
     
  20. TurtlePhish

    TurtlePhish Member

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    If it was .243, it would be in an AR-10 length action.

    Can we get a pic of the magazine?


    ETA:

    +1
     
  21. LJ-MosinFreak-Buck

    LJ-MosinFreak-Buck Member

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    Not to go off topic, but I'd love one in .243 lol
     
  22. janobles14

    janobles14 Member

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    k im dying to know this one! any word in the short time elapsed? but wouldnt the smaller shoulder mean it should be smaller than a .223?
     
  23. meanmrmustard

    meanmrmustard Member

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    Sorry, didn't see that post. Maybe a 6+ mm round? I'm assuming something near 45 mm in case length.
     
  24. TurtlePhish

    TurtlePhish Member

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    I'm really thinking 6.8SPC.
     
  25. floorit76

    floorit76 Member

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    Standard mags boys. I bought a 5.56 Pmag and it fits fine.
     
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