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Thread: Converting 5.56 to .458 socom.

  1. #1
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    Converting 5.56 to .458 socom.

    Has anyone ever converted a 5.56 ar to a .458 socom? I'm not talking about a complete upper, More like changing the barrel and bolt. What else would have to be changed? Would it be easier to just get a complete upper?

  2. #2
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    That's it...just the barrel and BCG. I did this exact conversion a few years ago.

    Would have been easier to just buy a complete upper, though. The individual parts were not easy to find at the time and I ended up paying more for the parts than I would have if I just bought a complete upper. I don't know if that's still true today.

  3. #3
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    Hi!

    I'd like to do the same thing. I always thought a modified upper reciever was needed also, wider ejection port or something like that.

    If I can use any upper I want, that would be very cool.

    As soon as my current build is done, the 458 is next!


    Thanks,
    Orvis

  4. #4
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    Yes, you have to enlarge the ejection port a bit, but you don't need any extra or special parts for the conversion.

  5. #5
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    Thanks.

    Would you hapten to if you coulp use PMags with it or just steel / aluminum mags?

  6. #6
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    I'm still pretty new to the 458 SOCOM, but for me the PMags have worked great for the 300gr Corbon loads since they're relatively short in length. I really like the Pmags for that loading. I'm not sure if the Corbon 405gr loads wil fit in a Pmag though since the Pmags have a reinforcing rib that runs down the inside front of the magazine, and I have yet to purchase or handload any 405gr bullets. I do know that the 500gr Round Nose Soft Points that I hand loaded (COL 2.245") do NOT fit with Pmags. I use a Lancer or HK mag for those (regular GI mags would probably work fine for the long 500gr loads as well.) I don't think you have to, but I take a file and carve out a small notch in the front of the magazine to allow for easier manual unloading of the magazine. Just personal preference. I've seen/heard of others doing the same thing. Here's a picture of my HK mag that has been modified as described with a dummy 500gr SP round loaded.



    Last edited by newarowner; 06-28-09 at 00:56.

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