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Thread: 5.45x39 AR Failure to Feed

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    Gunco Veteran pjm204's Avatar
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    Default 5.45x39 AR Failure to Feed

    I finished building up a 5.45 AR last night. Bolt head was made from a standard 5.56 bolt head opened up to .396. I brought along 6 different kinds of 5.56 magazines (magpul, troy, lancer, and a few different GI mags). If I drop a round into the upper receiver, with the bolt back, the bolt will load and chamber the round. Once I try it with a magazine, it strips the round and the bolt goes most of the way forward but binds up right before it gets to the barrel extension. It appears the round is canted slightly left to right. I know my first order of business is to get a 5.45 magazine. However, I am wondering if I have a different issue. Any ideas?

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    Gunco Addicted for life j427x's Avatar
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    thats a tough one--

    will if feed when fired? or does it just do this when hand cycled?

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    Gunco Veteran pjm204's Avatar
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    Quote Originally Posted by j427x View Post
    thats a tough one--

    will if feed when fired? or does it just do this when hand cycled?
    No, it will not feed when fired either. The bolt carrier just hangs up right before it hits the barrel extension. When this occurs the bolt is very difficult to pull back.

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    Gunco Addicted for life j427x's Avatar
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    is it the round hanging up or the bolt?

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    Gunco Veteran pjm204's Avatar
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    Quote Originally Posted by j427x View Post
    is it the round hanging up or the bolt?
    My theory is that the round is slightly canted in the chamber which is causing the bolt carrier to bind up. It is hard to tell since the round makes it most of the way into the chamber. Once I pull back on the charging handle, the round drops right into the chamber. I'll see if I can get pics. I ordered some 5.45 mags. I am going to see if it jams when the extractor is removed.

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    Gunco Addicted for life j427x's Avatar
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    does it chamber a round overly tight? ---

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    Gunco Veteran pjm204's Avatar
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    Well I figured out the issue. I ordered a few 5.45 mags. I received them last night and tested hand cycling. I was still getting the jam. I took it apart, and it was immediately obvious to me. The ejector was extended further than the front of the bolt. I guess when I put the roll pin through, it was pushed up against the ejector, and not through the slot. So a new roll pin was installed. I put it back together and it cycles perfectly. Easy fix, lesson learned.

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    Gunco Veteran perry's Avatar
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    OOOOOO..KKKKK... good job.

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    Gunco Veteran pjm204's Avatar
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    Quote Originally Posted by perry View Post
    OOOOOO..KKKKK... good job.
    haha, let's call it a mediocre job, a good job would have been installing the ejector correctly the first time

  10. #10
    Gunco Addicted for life j427x's Avatar
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    LOL yea there are a few fiddely tricks to it.

    hell i even had my DSA barreled M4orgery making me pound my head the other day. --and all over a very lightly bent gas tune--LOL!

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