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The AR57 select fire debacle…

Posted by on March 8, 2017

I love the idea of the 5.7, so it was all to natural to end up with a five-seven upper for my AR. When I tried that on my select fire receiver, I instantly fell into sad panda mood… Turns out the bolt carrier group provided is semi auto ONLY. Since its a special BCG, replacements were needed.

Just a pic of the two side by side shows there is not much difference, but enough to kill the giggle switch.

2 Responses to The AR57 select fire debacle…

  1. Chris mills

    Hey Rob. Stumbled across your page. Looking for info on
    A AR57 Full Auto bolt. Specifically how to tell which bolt in your post picture is FA configured. I bought a used 57 Gen 1 upper and I dont know what I have.
    Any guidance would be greatly appreciated.
    Thanks in advance.


    • Rob

      To get a F/A bolt that will trip the auto sear, Someone would have had to send in SOT/copy of MG registration and buy the specific bolt. As far as I know, none were shipped FA capable. Seems like there is a FA stamp on the end of the bolt. I’ll take pics of the end when I get back to the parts.

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