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  1. #1
    Plinker
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    Apr 2012
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    458 socom problem

    Ok I got my rock river arms 458 socom upper last week I shot 3 rounds then the bolt locked up/ round stuck in the chamber. I have only tryed Corbon 300gr. Can't find any other ammo in fort Wayne. Is there anyone with a 458 socom AR that has had this problem. Or is there something I can try. If there is someone in fort Wayne that has some ammo other than Corbon that I can buy to try it would be very appreciated. Any help
    Rock river said to clean the upper with a grinded down 12 gauge berrel brush. I tryed it but a no go.

  2. #2
    Sharpshooter Shootin'IN's Avatar
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    If it doesn't shoot with the proper sized ammo, no matter what it is I would send it back.

  3. #3
    Plinker
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    A buddy of mine had the same problem with 450gr Corbon's. The overall length of the bullet was too long and jammed it up. He bought these and hasn't had anymore problems.

    AMM-907 - .458 SOCOM SBR Barnes Tipped TSX BT 300 Grain 20 Round Box 1820 FPS Muzzle Energy 2206 Ft-Lb.

  4. #4
    Hop
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    Appleseed KD junkie Hop's Avatar
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    Mine did that at first too. The chambers are tight and a bit rough. It didn't take long to shoot out and become reliable.
    Snipers get more head...

  5. #5
    Plinker
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    So I just need to shoot it and change ammo? It just scares me because when the round get stuck it the chamber I have to take the upper off and pry the bolt back. The charge handle will not pull the bolt back.

  6. #6
    Hop
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    That's what I did. It took ~20 rounds to start smoothing out and ejecting. I could only find CorBon at first too but the SBR ammo did the same thing.

    Don't take the upper off. Point the riffle up, firmly hold the charge handle and smack the buttstock on a hard surface.
    Snipers get more head...

  7. #7
    Plinker
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    Apr 2012
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    Ok thanks I will just get some more ammo and go shooting. What brands of ammo you have tryed do you like the most.

  8. #8
    Hop
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    I've tried:
    CorBon JHP hunter
    SBR in several loads
    Blue box reloads from the guy @ the Indy 1500 in 300 JHP & 410 gr TFMJ (I think).

    All shoot great through the gun now except the longest 405 grain SBR. That one tends to hang up a little on the feed ramp. They all seem to group within ~1.5" @ 50 yards.

    I use a slightly modified P-mag (the ones with the V guide at the front of the follower) for all of the JHP. The longer bullets work better in metal mags but I haven't tried running any rounds through the newer Pmags without the V.

    The 400+ grain will put a serious GONG onto some Bobcat steel!
    Snipers get more head...

  9. #9
    Sharpshooter
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    Im running a RRA upper and never had this problem, but have heard of the rough chamber issue with their uppers. I was told to use a 20 ga. bore mop with Flitz on it in a drill to polish out the chamber. I'd use the Flitz sparingly and make sure the chamber is clean before trying to fire a round.
    I'll keep my guns, money, and freedom...you keep the "change".

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