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  1. #1
    I tried being reasonable, I didn't like it. Hornett's Avatar
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    458 SOCOM won't go into battery

    I bought a Radical Firearms upper last year and just cannot get it to run.
    I was not ejecting very well so I put in a ejector spring upgrade kit with the little o ring.
    Tried it again on Saturday before fathers day.
    Now it won't go into battery most of the time.
    I could get the first round to go in sometimes (with the charging handle), but never the second.
    The second round does not go into battery.
    It seems to stop right about where the bolt should start rotating.
    Feeding rounds one at a time, it is crazy accurate so it's worth investing some time.
    But I am not sure where to start.
    Any help is appreciated.
    Thanks!
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  2. #2
    Diamond Collision Inc. Avon. AllenM's Avatar
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    could it be the ejector is stiff and not ramping over the case? Also are you running a 458 buffer spring?
    07 FFL / SOT 2

    Complaining about a problem without posing a solution is called whining
    Teddy Roosevelt

  3. #3
    I tried being reasonable, I didn't like it. Hornett's Avatar
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    It may be.
    I wondered if that rubber washer was too stiff but I tried it anyway.
    It does seem to be ejecting better than it was before the rubber washer and spring ejector upgrade.
    Maybe, I should just remove the upgrade rubber washer and use the upgraded spring for the ejector.

    I do not have a 458 buffer spring or heavy buffer because the general consensus at Teppo Jutsu is 'The platform was designed to run on standard AR buffers, so ya' don't need 'em."
    But I am open to any suggestions.
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  4. #4
    Diamond Collision Inc. Avon. AllenM's Avatar
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    I am not real familiar with them but the Rock River i had came with 2 different springs
    07 FFL / SOT 2

    Complaining about a problem without posing a solution is called whining
    Teddy Roosevelt

  5. #5
    Plinker cncswiss1's Avatar
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    not ejecting very well is normally gas settings-
    the extractor spring is putting more bite on the case and making it harder to chamber,I'd remove it

    I would swap out the spring for a stronger one if you have a few laying around. and if you have parts laying around i would weigh your buffers to find the lightest one.

    these rounds that failed to eject well wouldn't be the 140 grain Polycase rounds would they? they fly so much faster the gas dwell time is shorter and they will short stroke (or come real close to) most rifles (I have 4 458's and only 1 runs them 100%)

    check BCG "freeness", check for crud in gas system, check gas block alignment (use air blow method if needed). check for schmutz in the gas pipe on the top of the BCG (I've seen it)

    *edit for spelling and poor grammar

  6. #6
    I tried being reasonable, I didn't like it. Hornett's Avatar
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    not ejecting very well is normally gas settings-
    the extractor spring is putting more bite on the case and making it harder to chamber,I'd remove it

    Okay, I will do that tonight.

    I would swap out the spring for a stronger one if you have a few laying around. and if you have parts laying around i would weigh your buffers to find the lightest one.
    I don't have any spare parts at all. I am assuming you mean the buffer spring here, Right?

    these rounds that failed to eject well wouldn't be the 140 grain Polycase rounds would they? they fly so much faster the gas dwell time is shorter and they will short stroke (or come real close to) most rifles (I have 4 458's and only 1 runs them 100%)
    No 300 grain running at 1800 fps according to the box

    check BCG "freeness", check for crud in gas system, check gas block alignment (use air blow method if needed). check for schmutz in the gas pipe on the top of the BCG (I've seen it)
    Kind of a noob to diagnosing problems, how do you do the "air blow method"
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  7. #7
    Grandmaster halfmileharry's Avatar
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    Have you got another BCG laying around? That's the FIRST thing I'd try.
    I'd go to the gas system next. Check the gas block alignment, hole in the barrel, and make sure the gas tube is free and open.
    I had a bad gas block a couple of years ago. I never imagined a bad gas block but I had one first hand. It was hard to diagnose as the problem was intermittent.
    The more you sweat in training the less you bleed in battle.

  8. #8
    I tried being reasonable, I didn't like it. Hornett's Avatar
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    Yes, I took the BCG out of my 5.56 AR that runs really well and switched them.
    After that neither gun would chamber a round.
    We switched them back and the 5.56 ran fine again.
    That is why I am pretty sure CNCSwiss1 was right and I need to take the extra o ring out of the extractor.

    But I also think there is more going on than the extractor tuning with the SOCOM...

    I will take a look at the gas block too.
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  9. #9
    Grandmaster halfmileharry's Avatar
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    When you say "chamber" do you mean EVEN when cycling manually a round will NOT chamber into the barrel?
    OR it will NOT cycle and load the next round into the chamber after the previous round fires?
    I've seen gas blocks loose and slide away from the barrel port. I'd be starting with taking the good bcg and using it, re-align, clean, secure gas system first.
    Last edited by halfmileharry; 1 Week Ago at 19:16.
    The more you sweat in training the less you bleed in battle.

  10. #10
    Marksman usmcdjb's Avatar
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    I bought a RRA upper half and put it on one of my lowers some time ago. Had all kinds of trouble with it. Was using Cor Bon Hunter 300 gr JHP. It wouldn't always go into battery. Sometimes needing to mortar it on the ground to get the round out. Wouldn't eject right when I did get it to chamber and fire. Gun went back to RRA where they reamed the chamber, tested, and sent it back saying it was ok. Kept having troubles. RRA said it was the ammo. Cor Bon said it was the rifle.

    I bought another 458 complete rifle, and continued to have issues with the ammo. In the end, I got some Wilson Combat ammo and it functioned fine. And Cor Bon ended up replacing the ammo a few times before it finally worked.

    I don't know if your problem is the same, just stating what I had happen. It was frustrating beyond belief and a lot of time before I think everything was sorted.

    Good luck.

    Once an adult - twice a child.

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